Flow, Turbulence and Combustion最新文献

{"title":"Development of A Lightweight Neural Network for Predicting Reaction Rates in RANS Simulations of Flame-Wall Interactions","authors":"Maximilian Bambauer,&nbsp;Vipin Michael,&nbsp;Markus Klein,&nbsp;Nilanjan Chakraborty","doi":"10.1007/s10494-026-00796-2","DOIUrl":"10.1007/s10494-026-00796-2","url":null,"abstract":"<div><p>Accurate prediction of Flame-Wall Interactions (FWI) is crucial for the design of compact, high-efficiency combustors but remains a significant challenge for Reynolds-Averaged Navier-Stokes (RANS) simulations. This study presents the development and validation of a lightweight data-driven closure for the mean reaction rate, trained on high-fidelity Direct Numerical Simulation (DNS) data of a V-shaped turbulent premixed flame. To ensure numerical stability and physical consistency, the training methodology incorporates a logarithmic transformation of the reaction rate target and a novel error-function transformation of the wall distance, effectively localizing the model’s sensitivity to the near-wall quenching zone. A-priori validation demonstrates that the neural network accurately captures the mean reaction rate statistics and extrapolates successfully to unseen spatial regions. However, a-posteriori assessment in coupled RANS simulations reveals a critical sensitivity to input feature consistency. The full-feature model (7 input parameters), which includes turbulent kinetic energy and dissipation rate as inputs, fails to predict the correct quenching behavior due to significant discrepancies between the DNS-extracted turbulence quantities used for training and the corresponding quantities obtained from RANS. In contrast, a reduced-feature model (3 input parameters), relying exclusively on the mean progress variable, its gradient, and the transformed wall distance, demonstrates remarkable robustness. By decoupling the prediction from uncertain turbulence quantities, the model with 3 input parameters accurately reproduces the V-flame structure, achieving performance comparable to a manually tuned algebraic closure. Furthermore, the reduced model exhibits strong generalization capabilities, successfully predicting the transient physics of a Head-On Quenching (HOQ) configuration that was not present in the training dataset. These findings highlight that for data-driven RANS closures, selecting input features that remain consistent across fidelity levels, is paramount for achieving predictive stability and generalization.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 4","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00796-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconsidering Einstein’s Derivation of Diffusion Equation to Provide Solutions Consistent with Nano-Scale and Multi-Scale Physics","authors":"Gregory Aranovich","doi":"10.1007/s10494-026-00800-9","DOIUrl":"10.1007/s10494-026-00800-9","url":null,"abstract":"<div><p>We propose corrections to the diffusion equation providing solutions consistent with nano-scale and multi-scale physics. These corrections can be useful for various applications, including nano-technology, strong-gradient and rarefied transport. The problem is that the classical diffusion equation (which terms are in the core of fluid dynamics models) does not carry information about the structure of the fluid, and fails, for example, at the nano- and multi-scale. As we show here, this information was lost due to the way the original equation was derived. In this paper, we reconsidered Einstein’s derivation of the diffusion equation to eliminate truncation of higher terms. The results give the finite difference equation of mass transport where information about the fluid structure is not lost; this is because the finite-difference length is not a numerical discretization parameter but a mean free path, <i>λ</i>, a fluid property determined by the structure of the fluid and by molecular mechanisms of collision. For this reason, the (<i>λ-</i>discretized) finite difference diffusion equation becomes consistent with nano-scale and multi-scale physics. This is demonstrated by specific examples.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 4","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel Low-y⁺ Roughness Correlation for Hydrogen-Fired Jet Burners Validated Under Isothermal and Reacting Conditions","authors":"Robin Vivoli,&nbsp;Daniel Pugh,&nbsp;Anthony Giles,&nbsp;Burak Goktepe,&nbsp;Tomas Davies,&nbsp;Steven Morris","doi":"10.1007/s10494-026-00799-z","DOIUrl":"10.1007/s10494-026-00799-z","url":null,"abstract":"<div><p>Surface roughness has a critical influence on the aerothermal and combustion behavior of gas turbine burners, particularly with the growing use of additively manufactured (AM) components that exhibit inherently rougher surfaces than conventionally machined parts. This study investigates the impact of surface roughness on flow and flame dynamics in a premixed jet burner (PJB) operating under both isothermal-air and reacting hydrogen-fired conditions. Experimental measurements using Laser Doppler Anemometry (LDA) and OH* chemiluminescence were complemented by Computational Fluid Dynamics (CFD) simulations employing Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) frameworks. Building upon existing equivalent sand-grain roughness (kₛ) models, a novel correlation incorporating both measured roughness parameters and bulk flow velocity was developed to improve predictive accuracy for resolved boundary layers (y⁺ ≈ 1), a regime in which k_s⁺ &gt; y⁺ is common and standard roughness-function formulations lose validity. The new correlation demonstrated strong agreement with experimental data in isothermal simulations. When extended to reacting hydrogen–air flames, RANS simulations successfully reproduced roughness-induced flow redistribution and flame shortening, although DES tended to overpredict bluff-body effects and underperform under lean conditions. Overall, the proposed k_s correlation, validated under isothermal conditions, provides a computationally efficient framework for modelling surface-roughness effects, and its extension to reacting hydrogen flames, particularly under RANS, offers a promising basis for future development toward additively manufactured gas turbine components.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13642420/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149126298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Wind Direction on Flow and Turbulent Statistics Over a Realistic Urban Area: A Large-Eddy Simulation Study","authors":"J. M. Duró,&nbsp;E. Mestres,&nbsp;M. Teng,&nbsp;O. Lehmkuhl,&nbsp;I. Rodríguez","doi":"10.1007/s10494-026-00790-8","DOIUrl":"10.1007/s10494-026-00790-8","url":null,"abstract":"<div><p>Effects of wind direction in realistic urban boundary layers remain difficult to characterize systematically because local flow patterns, and turbulent statistics within a realistic urban canopy may respond differently to changes in the approaching wind. To investigate these multi-scale directional impacts, we conducted high-resolution large-eddy simulations of the atmospheric boundary layer over the Zona Universitària Pedralbes district in Barcelona. The computational meshes employ fourth-order spectral elements, yielding pedestrian-level resolutions below 1 m and resulting in approximately <span>(bf{5.0times 10^8})</span> degrees of freedom. Sixteen wind directions uniformly distributed over 360<span>({}^circ)</span> are simulated to capture the full directional response of the urban fabric. At pedestrian level, the flow exhibits strong directional sensitivity, with moderate rotations of the incoming wind reorganizing the dominant flow pathways from continuous accelerated corridors, when winds align with major street axes, to fragmented cellular patterns under oblique inflows. These directionally activated channeling corridors govern local ventilation and sheltering. Yet, despite this pronounced local variability, double averaged vertical profiles of mean velocity and turbulence intensity collapse remarkably across all wind directions. Two distinct inflection points are consistently identified in the mean velocity profiles: one located slightly below the average building height, <span>(bf{H_mathrm{avg}})</span>, confirming the persistence of a shear-driven mixing-layer regime even in highly heterogeneous urban morphology, and a second, deeper inflection point near pedestrian level, approximately 0.08–0.10 <span>(bf{H_mathrm{avg}})</span> above the ground, that marks the transition between recirculating near-ground flow and more connected transport within the urban canopy. Subdomain analysis further shows that this lower inflection point is morphology- and direction-dependent, reflecting changes in the transition between sheltered near-ground recirculation and transport within the urban canopy as preferential flow routes are activated or suppressed by the incoming wind direction. It is shown that urban aerodynamic response is simultaneously robust at the neighbourhood scale, behaving quasi-isotropically in the double-averaged sense, and strongly directional at the local scale, where the activation of preferential ventilation pathways dictates the spatial distribution of momentum and turbulence.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00790-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Investigation of a New Passive Flow Control Technique to Improve Near-Wake Profiles of a Ducted Wind Turbine","authors":"Maytham M. Abid,&nbsp;Marc Marín-Genescà","doi":"10.1007/s10494-026-00793-5","DOIUrl":"10.1007/s10494-026-00793-5","url":null,"abstract":"&lt;div&gt;&lt;p&gt;This study investigates the potential of a novel ducted horizontal-axis wind turbine equipped with an integrated passive flow-control technique (DWT) to enhance wake recovery and power extraction. The PFCT differs from prior mechanisms: unlike brims and flanges (Watanabe et al. 2019; Abe and Ohya 2004; Abe et al. 2005) that rely on radial expansion and brim suction, the PFCT employs three vertically stacked, 40°-inclined sheets generating streamwise vortices that actively entrain ambient fluid into the wake core. Unlike stabilization plates (Watanabe et al. 2019) that suppress vortex shedding, PFCT sheets exploit and organize vortex shedding into coherent streamwise vortices for multi-layer wake mixing. Unlike lobed ejectors (Han et al. 2015) that delay boundary-layer separation in internal flows, PFCT sheets are external ramp-type surfaces interacting with rotor tip vortices in the freestream bypass region. Unlike conventional vortex generators (Nunes et al. 2020; Sullerey et al. 2001; Chong et al. 2008) that energize boundary layers via small tabs, PFCT sheets are large-scale, geometrically integrated wake modifiers operating on global wake structure through pressure-driven entrainment plus vortex-enhanced mixing. Three-dimensional URANS simulations (k–ω SST) were validated against wind tunnel experiments. Validation was performed across three streamwise planes at 1·5D, 2·0D, and 2·5D downstream of the rotor, quantified by mean absolute error (MAE) and root mean square error (RMSE). Grid independence was confirmed through a mesh-sensitivity study. A staged temporal-resolution strategy was adopted for the transient simulations to accurately resolve rotor–wake evolution. Torque convergence remained within 2.3%, and residuals remained below 10&lt;sup&gt;− 7&lt;/sup&gt;. Comparative analyses were performed for a bare wind turbine (BWT), a free ducted wind turbine (FDWT), and the proposed DWT. Numerical results indicated that the DWT achieved a peak power coefficient (C&lt;sub&gt;p&lt;/sub&gt;) of 43.2%, an 85.4% improvement over the computationally evaluated BWT. The new duct design mitigated wake deficits, yielding an area-averaged wake velocity ratio 4.15× higher than the BWT(1.79× relative to the FDWT) at 1·5D downstream. Near-wake analysis indicated a 21-fold increase in turbulent kinetic energy compared to the BWT, reflecting enhanced local mixing. However, velocity recovery advantages were distance-dependent, with the DWT showing superior performance at 1·5D but reduced area-averaged velocity relative to the FDWT by 2·5D. This reversal reflected the DWT’s higher energy extraction, which depletes wake momentum more severely; the PFCT-induced vortices that accelerated early recovery decayed by 2·5D, leaving a more depleted wake than that of the FDWT’s gentler, sustained recovery. Consequently, the DWT demonstrated improved downstream inflow conditions for the 2D tandem configuration investigated in this study, whereas the single-turbine wake analysis indicated","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating Flow Control Methods in Vehicle Platooning and Overtaking","authors":"Saber Karimi,&nbsp;Babak Mohammadikalakoo,&nbsp;Paolo Schito","doi":"10.1007/s10494-026-00797-1","DOIUrl":"10.1007/s10494-026-00797-1","url":null,"abstract":"<div><p>This numerical study, based on steady RANS simulations, investigates the effects of passive, active, and combined flow control techniques on a simplified vehicle model (Ahmed body) under highway-relevant configurations, including platooning and overtaking, at 70 mph (31.3 m/s). The study primarily focuses on an innovative passive flow control method, Rear Linking Tunnels (RLTs), previously introduced by the authors. It also examines the performance of the Single Dielectric Barrier Discharge Actuator (SDBD) as an active flow control strategy and evaluates its combined effects with RLTs on both the target vehicle and surrounding vehicles during platooning and overtaking maneuvers. The results highlight notable variations in drag and lift coefficients, showing that the effectiveness of these flow control methods differs significantly between platooning/overtaking scenarios and single-vehicle cases.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00797-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantifying the Scale Effect in Hydrogen/Air Explosions Using High-Fidelity Simulations with Detailed Chemistry","authors":"Maximilian Bambauer,&nbsp;Josef Hasslberger,&nbsp;Finn Ohlendieck,&nbsp;Markus Klein","doi":"10.1007/s10494-026-00795-3","DOIUrl":"10.1007/s10494-026-00795-3","url":null,"abstract":"<div><p>This study investigates the scale effect in hydrogen-air explosions using high-fidelity 2D and 3D numerical simulations with detailed chemistry. Simulations are conducted in an obstacle-laden channel, varying the geometric scaling factor, hydrogen mole fraction and dimensionality. Results show that flame acceleration increases significantly with geometric scale, primarily due to the enhanced growth of the turbulent flame surface area. Additionally, the local burning rate per unit flame area exhibits a complex dependency on scale and mixture composition, characterized by flame stretch and Markstein numbers, particularly in lean mixtures. It is found that the normalized critical distance to reach a specific velocity decreases as a power-law with increasing scale, confirming that explosions accelerate more effectively over shorter relative distances in larger facilities. While 2D simulations suggest that the corresponding power-law exponents are consistent across a wide range of equivalence ratios, 3D results reveal a critical deviation. The scale effect is significantly more pronounced in 3D than in 2D, where the flame acceleration is found to be significantly stronger and this holds particularly for lean mixtures. The findings are consistent with scale-dependent experimental results obtained in the laboratory-scale MiniRUT and the industrial-scale RUT facilities. They further demonstrate that two-dimensional approximations may substantially underpredict the scale sensitivity of lean hydrogen explosions. In this case, 3D effects are identified as crucial for accurately predicting the severity of hydrogen explosions.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00795-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spray Evolution, Turbulent Mixing, and Combustion Behavior of Diesel–Ammonia–Methanol Ternary Fuel Blends: A CFD Study","authors":"Ata Ahmadabadi,&nbsp;Hamed Chehrmonavari,&nbsp;Amirhasan Kakaee","doi":"10.1007/s10494-026-00798-0","DOIUrl":"10.1007/s10494-026-00798-0","url":null,"abstract":"<div><p>The interaction between spray dynamics, turbulence, and combustion strongly influences the performance of compression-ignition engines operating with alternative fuels. This study employs a validated three-dimensional computational fluid dynamics (CFD) model to investigate the effects of diesel–methanol–ammonia ternary blends on in-cylinder flow, turbulent mixing, combustion characteristics, and emissions in a heavy-duty diesel engine. The simulations show that increasing ammonia content prolongs spray penetration, sustains higher turbulence kinetic energy around top dead center, and delays ignition because of its high latent heat of vaporization and low reactivity. In contrast, methanol enhances atomization, accelerates evaporation, and intensifies premixed combustion, resulting in a 7.9% increase in peak firing pressure relative to diesel. The combined action of methanol and ammonia produces more stable combustion than ammonia-only blends by moderating the pressure-rise rate while maintaining favorable heat-release characteristics. A specifically identified ternary blends improve the conventional NOₓ–soot trade-off, achieving 16.5% lower NOₓ emissions together with 3.5% lower soot emissions than neat diesel, whereas high-ammonia formulations substantially suppress soot because of their carbon-free chemistry but increase CO and unburned hydrocarbon emissions owing to slower oxidation kinetics. These results demonstrate that appropriate diesel–methanol–ammonia blending effectively tailors spray evolution, turbulence development, combustion phasing, and emission characteristics, providing valuable guidance for the design of stable and cleaner low-carbon compression-ignition combustion systems.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Merging Filtering, Modeling and Discretization to Simulate Large Eddies In Burgers’ Turbulence","authors":"Roel Verstappen","doi":"10.1007/s10494-026-00789-1","DOIUrl":"10.1007/s10494-026-00789-1","url":null,"abstract":"<div><p>The research presented seeks to advance large-eddy simulation (LES) through the integration of its three core components - filtering, modeling and discretization. The integrated approach is developed for LES of Burgers’ turbulence in one spatial dimension, serving as an initial step toward future extensions to three-dimensional turbulent flows. Too small scales of motion are removed by applying conservation laws over control volumes of user-defined size, establishing the computational grid. Two spatial filters emerge: one from grid-cell averaging and another from the cell-to-face interpolation used to evaluate fluxes on cell faces. The interpolation-induced filter sets the effective resolution of the flux and thereby determines the large eddies. The net effect of smaller scales is modeled in a way that aligns physical and numerical interpretations, treating filtering, modeling and discretization as a coherent whole. The two spatial filters partition kinetic energy into three: a subgrid part, the energy of the large eddies and that of the supergrid scales filtered-out by the cell-to-face interpolation. The latter scales do not contribute to the convective flux and are subordinate to the large eddies, while subgrid scales are truncated by the grid, simplifying modeling. The model ensures that large eddies do not generate smaller scales, with consistency enhanced via Richardson extrapolation. The approach is validated on 1D decaying Burgers’ turbulence.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00789-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149034917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of Hybrid Transported-Tabulated Chemistry for Efficient Large-Eddy Simulation of Turbulent Combustion","authors":"Achyut Panchal,&nbsp;Reetesh Ranjan,&nbsp;Suresh Menon","doi":"10.1007/s10494-026-00794-4","DOIUrl":"10.1007/s10494-026-00794-4","url":null,"abstract":"<div><p>The performance of a hybrid transported-tabulated chemistry (HTTC) strategy is evaluated for large-eddy simulations (LES) of turbulent combustion with detailed finite-rate kinetics. The computational cost of LES is reduced in the HTTC approach by segregating the species list into major and minor species, with the former transported and the latter tabulated. Apart from reducing the number of transported species, the HTTC approach and its variants decrease computational cost by enabling efficient computation of thermodynamics and transport properties and by relieving the stiffness of chemical source terms. The calculations can be up to 11 times faster with stiff kinetics (29 species, 141 steps), as the HTTC approach eliminates the need to integrate and transport the minor species, which typically have short chemical times. The original HTTC and other variants are assessed for their accuracy, efficiency, and robustness for LES by considering two temporally evolving challenging test cases: a freely propagating turbulent premixed flame in the thin reaction zone regime and a turbulent non-premixed jet flame exhibiting local extinction and re-ignition. Modifications to the original HTTC approach are considered and evaluated to account for the effect of subgrid-scale turbulence. Both a priori and a posteriori analyses are conducted to evaluate the accuracy of the HTTC approach. The turbulent premixed flame test shows noticeable yet small differences between the calculated and tabulated concentrations of minor species. This results in reasonable predictions of reaction rates and overall combustion process with HTTC. The difference between calculated and tabulated minor species concentrations is larger for the turbulent non-premixed flame case; however, the minor species concentrations are generally much lower for it, and therefore, extinction-re-ignition physics is still predicted well with HTTC.</p></div>","PeriodicalId":559,"journal":{"name":"Flow, Turbulence and Combustion","volume":"117 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10494-026-00794-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148986841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}