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CALCULATION OF THE LINEAR STABILITY OF LIQUID FLOW IN A FLAT CHANNEL WITH STREAMWISE WAVY WALLS 计算带波浪形流壁的平槽中液体流动的线性稳定性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060093
Yu. Ya. Trifonov
{"title":"CALCULATION OF THE LINEAR STABILITY OF LIQUID FLOW IN A FLAT CHANNEL WITH STREAMWISE WAVY WALLS","authors":"Yu. Ya. Trifonov","doi":"10.1134/S0021894423060093","DOIUrl":"10.1134/S0021894423060093","url":null,"abstract":"<p>The full Navier–Stokes equations are used to study the linear stability of plane Poiseuille flow in a channel with the lower wall corrugated along the flow, due to which the flow has two velocity components. A generalized eigenvalue problem is solved numerically. Three types of perturbations are considered: plane periodic (zero Floquet parameter), plane doubly periodic (finite values of the Floquet parameter), and spatial perturbations. Neutral curves are analyzed in a wide range of the corrugation parameter and Reynolds number. It is found that the critical Reynolds number above which time-growing perturbations appear depends in a complex way on the dimensionless amplitude and period of corrugation. It is shown that in the case of flow in a channel with corrugated wall, three-dimensional perturbations are usually more dangerous. The exception is the small amplitude of corrugation at which plane perturbations are more dangerous.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1000 - 1010"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EFFECT OF INTERNAL PYLONS ON THE PARAMETERS OF THE JET FLOW IN A NOZZLE WITH A CENTRAL BODY 内塔对带中心体喷嘴中射流参数的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060160
N. P. Kiselev, I. N. Kavun, V. I. Zapryagaev, R. A. Styazhkin
{"title":"EFFECT OF INTERNAL PYLONS ON THE PARAMETERS OF THE JET FLOW IN A NOZZLE WITH A CENTRAL BODY","authors":"N. P. Kiselev,&nbsp;I. N. Kavun,&nbsp;V. I. Zapryagaev,&nbsp;R. A. Styazhkin","doi":"10.1134/S0021894423060160","DOIUrl":"10.1134/S0021894423060160","url":null,"abstract":"<p>A high-velocity flow in an axisymmetric nozzle containing a central body and pylons is studied. The influence of the geometry of the main and additional pylons on the gas-dynamic and thrust characteristics at the nozzle exit in the flow regime with <span>(n_{pr}= 2.25)</span> (<span>(n_{pr})</span> is the ratio of the pressure in the settling chamber to the ambient pressure) is determined. Azimuthal nonuniformity of the flow at the nozzle exit is detected. The maximum azimuthal nonuniformity is observed in the wake behind the pylons. It is shown that a three-dimensional transonic flow is formed in the nozzle duct with the pylons mounted in the minimum free cross section; local supersonic regions closed by weak shock waves are formed in this flow. It is found that the formation of such a shock wave structure is responsible for nozzle thrust reduction by 12%.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1058 - 1067"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PHYSICOMATHEMATICAL MODELING OF HUMAN BREATHING IN SITUATIONS OF VARIOUS PULMONARY DISEASES 各种肺部疾病情况下人体呼吸的物理数学模型
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060147
P. S. Golysheva, A. E. Medvedev
{"title":"PHYSICOMATHEMATICAL MODELING OF HUMAN BREATHING IN SITUATIONS OF VARIOUS PULMONARY DISEASES","authors":"P. S. Golysheva,&nbsp;A. E. Medvedev","doi":"10.1134/S0021894423060147","DOIUrl":"10.1134/S0021894423060147","url":null,"abstract":"<p>Three-dimensional numerical simulations of the air flow in the full human bronchial tree in situations of obstructive and chronic pulmonary diseases are performed. Based on the previously developed three-dimensional analytical model of the lower respiratory airways, the air distributions in the lungs (from the trachea to alveoli) in situations with lung injuries and bronchial asthma are calculated. Breathing modeling is based on a numerical technique of step-by-step computations, which allows one to avoid the loss of solution accuracy caused by the difference in the bronchus scales; moreover, the time needed to calculate the air flow in the lungs can be reduced by several times by using this technique.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1041 - 1045"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NUMERICAL SIMULATION OF A NANOPARTICLE IMPACT ONTO A TARGET BY THE MOLECULAR DYNAMICS METHOD UNDER THE CONDITIONS OF COLD GAS-DYNAMIC SPRAYING 在冷气体动力喷射条件下利用分子动力学方法对纳米粒子撞击目标的数值模拟
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060044
O. V. Belai, S. P. Kiselev, V. P. Kiselev
{"title":"NUMERICAL SIMULATION OF A NANOPARTICLE IMPACT ONTO A TARGET BY THE MOLECULAR DYNAMICS METHOD UNDER THE CONDITIONS OF COLD GAS-DYNAMIC SPRAYING","authors":"O. V. Belai,&nbsp;S. P. Kiselev,&nbsp;V. P. Kiselev","doi":"10.1134/S0021894423060044","DOIUrl":"10.1134/S0021894423060044","url":null,"abstract":"<p>Results on a nanoparticle impact onto a target calculated by the molecular dynamics method are presented. The first problem being solved is the nanoparticle impact onto a target under the conditions of cold gas-dynamic spraying. The second problem deals with nanoparticle extension, which adheres to the target due to the impact. It is shown that a chemical bond between the nanoparticle and target is formed during the impact. The bond in the case of the titanium nanoparticle impact onto an aluminum target is found to be stronger than that in the case of the aluminum nanoparticle impact onto a titanium target. The reason is that the titanium nanoparticle penetrates into the aluminum target to a greater depth.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"964 - 971"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PHYSICAL MECHANISMS OF VAPOR BUBBLE COLLAPSE DURING LASER-INDUCED BOILING 激光诱导沸腾过程中气泡崩溃的物理机制
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060135
V. A. Kosyakov, R. V. Fursenko, S. S. Minaev, V. M. Chudnovskii
{"title":"PHYSICAL MECHANISMS OF VAPOR BUBBLE COLLAPSE DURING LASER-INDUCED BOILING","authors":"V. A. Kosyakov,&nbsp;R. V. Fursenko,&nbsp;S. S. Minaev,&nbsp;V. M. Chudnovskii","doi":"10.1134/S0021894423060135","DOIUrl":"10.1134/S0021894423060135","url":null,"abstract":"<p>Effects of various physical mechanisms at the stage of vapor bubble collapse and the subsequent formation of a shaped-charge jet in the process of laser-induced boiling near the end of a thin waveguide immersed in a cold liquid is studied numerically. Depending on the evaporation intensity, three process modes are identified and described.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1036 - 1040"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
USING A LEADER SAMPLE TO PREDICT THE CREEP AND LONG-TERM STRENGTH OF A MATERIAL DURING DUCTILE FRACTURE 利用引线样品预测材料在韧性断裂过程中的蠕变和长期强度
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060238
V. P. Radchenko, E. A. Afanaseva, M. N. Saushkin
{"title":"USING A LEADER SAMPLE TO PREDICT THE CREEP AND LONG-TERM STRENGTH OF A MATERIAL DURING DUCTILE FRACTURE","authors":"V. P. Radchenko,&nbsp;E. A. Afanaseva,&nbsp;M. N. Saushkin","doi":"10.1134/S0021894423060238","DOIUrl":"10.1134/S0021894423060238","url":null,"abstract":"<p>A method is developed for predicting creep and long-term strength based on the behavior of a previously tested sample (leader sample, prototype) in the case of ductile fracture. It is assumed that a loaded material does not undergo instantaneous plastic deformation and the first stage of creep. The incompressibility hypothesis is fulfilled in this case. It is shown that, if a constant-stress creep curve and the time to fracture are known for a leader sample, then obtaining a diagram of rheological deformation and long-term strength of the material at other stress values requires knowing only the initial (at the initial time) minimum creep strain rate of the samples for these stress values. The relevance of the developed method is checked with experimental data in two types of tests. The first type is tension tests of 12Kh18N10T corrosion-resistant steel samples at a temperature of 850°C and titanium alloy samples at a temperature of 600°C and the second type is tension and torsion tests of D16T alloy samples at a temperature of 250°C. It is shown that the prediction results are independent of the choice of a leader sample from many samples tested at different stresses. The possibility of using the developed method in experimental studies of creep of materials until their fracture is discussed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1119 - 1127"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
USING TWO-PARAMETER VELOCITY PROFILES FOR THREE-DIMENSIONAL BOUNDARY LAYERS 使用双参数速度剖面测量三维边界层
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060172
A. V. Boiko, N. V. Demidenko
{"title":"USING TWO-PARAMETER VELOCITY PROFILES FOR THREE-DIMENSIONAL BOUNDARY LAYERS","authors":"A. V. Boiko,&nbsp;N. V. Demidenko","doi":"10.1134/S0021894423060172","DOIUrl":"10.1134/S0021894423060172","url":null,"abstract":"<p>Approximations of the profiles of the longitudinal and transverse velocity components in the boundary layer calculated for the flows around a swept wing and a body of revolution by means of solving the full Navier–Stokes equations and using the boundary layer profiles from the self-similar one-parameter family of the Falkner–Skan–Cooke profiles and two-parameter family of profiles proposed by Gaster are compared. A significant advantage of using the approximation of the numerical profiles near three-dimensional separation by profiles from the two-parameter family is demonstrated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1068 - 1077"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
APPROXIMATE SOLUTION OF THE PROBLEM OF FLOW IN A FAR PLANE MOMENTUMLESS TURBULENT WAKE 远平面无动量湍流尾流中流动问题的近似解法
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S002189442306007X
A. V. Shmidt
{"title":"APPROXIMATE SOLUTION OF THE PROBLEM OF FLOW IN A FAR PLANE MOMENTUMLESS TURBULENT WAKE","authors":"A. V. Shmidt","doi":"10.1134/S002189442306007X","DOIUrl":"10.1134/S002189442306007X","url":null,"abstract":"<p>The flow in a far plane momentumless turbulent wake is described using a mathematical model obtained from the algebraic Rodi model of Reynolds stresses. The model is similar to the two-parameter (<span>(k{-}varepsilon)</span>) turbulence model in the far-wake approximation with a modified empirical constant in the diffusion terms of the equations. A group-theoretical analysis of the mathematical model of the wake is carried out, and a self-similar reduction of the model equations to a system of ordinary differential equations is performed. An approximate solution of the corresponding boundary-value problem is constructed using an asymptotic expansion of the solution in the vicinity of a singular point.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"987 - 992"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FINITE ELEMENT–BOUNDARY ELEMENT BASED VIBROACOUSTIC MODEL FOR NONHOMOGENEOUS TURBULENT BOUNDARY LAYER EXCITED COMPOSITE PANELS INVOLVING THE CHOLESKY DECOMPOSITION 基于有限元-边界元的非均质湍流边界层激励复合板振动声学模型，涉及乔尔斯基分解法
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S002189442306024X
B. R. Adhikary, A. Sahu, P. Bhattacharya
{"title":"FINITE ELEMENT–BOUNDARY ELEMENT BASED VIBROACOUSTIC MODEL FOR NONHOMOGENEOUS TURBULENT BOUNDARY LAYER EXCITED COMPOSITE PANELS INVOLVING THE CHOLESKY DECOMPOSITION","authors":"B. R. Adhikary,&nbsp;A. Sahu,&nbsp;P. Bhattacharya","doi":"10.1134/S002189442306024X","DOIUrl":"10.1134/S002189442306024X","url":null,"abstract":"<p>An original numerical framework is developed in the present research work in order to estimate the free field sound radiation from baffled structural panels subjected to nonhomogeneous turbulent boundary layer flow-induced excitation. A sequence of semi-analytical methods is used to estimate the nonhomogeneous turbulent boundary layer wall pressure spectrum, which is decomposed using the Cholesky technique to obtain the random wall pressure in the frequency domain. Structural panels are modeled using the finite element technique, and a coupled finite element-boundary element modeling technique is developed to estimate the sound power level radiated into the free field. Results are obtained for laminated composite structural panels with various fiber orientations.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1128 - 1140"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
NUMERICAL SIMULATION OF THE GAS DYNAMICS OF NITROGEN JETS EXHAUSTING INTO A RAREFIED SPACE 氮气射流排入稀薄空间的气体动力学数值模拟
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060068
A. V. Zaitsev, L. V. Yarkov
{"title":"NUMERICAL SIMULATION OF THE GAS DYNAMICS OF NITROGEN JETS EXHAUSTING INTO A RAREFIED SPACE","authors":"A. V. Zaitsev,&nbsp;L. V. Yarkov","doi":"10.1134/S0021894423060068","DOIUrl":"10.1134/S0021894423060068","url":null,"abstract":"<p>A nitrogen jet expanding during its exhaustion from a nozzle into a vacuum chamber is numerically simulated by a hybrid approach. The flow parameters in the nozzle and in the near field of the jet are determined by solving the Navier–Stokes equations by using the ANSYS Fluent software. The gas flow at large distances from the nozzle exit is modeled by the Direct Simulation Monte Carlo method by using the SMILE software system. Such an approach makes it possible to perform sufficiently accurate simulations in the near field of the jet; moreover, the temperature nonequilibrium of the expanding gas jet and other effects of rarefaction in the far field of the jet are taken into account. The approach is verified by using various approximate analytical models of gas exhaustion into vacuum. A comparison of the numerical results with available experimental data shows that they are in good agreement.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"979 - 986"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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