Aerodynamic simulation of plunging airfoil with heat effects and Lattice Boltzmann technique

Abstract

In this investigation, finite difference lattice Boltzmann method (FD_LBM) is developed to solve heat transfer effect behavior on the symmetrical and unsymmetrical airfoils with plunge oscillations. In this simulation, the equations of motion and energy are executed using LBM and FD simultaneously. The LB method is integrated with ghost flow for predicted curve boundary. The ghost flow method is a Cartesian-based method that, in addition to being practical and straightforward, retains many advantageous features of structured meshes, can be used for complex geometries, and has a high degree of flexibility. In other words, when the body oscillates, it is important to determine its position caused by the change in the mesh structure at any time. While the ghost method detects the object's position well, the new technique can capture the details of flow more accurately and stably than the other methods. Combining the ghost method with LBM provides a new technique that can investigate thermal behavior's effect on the airfoil with greater accuracy and stability. This combination of modern methods with high accuracy and stability in complex geometries has not been studied. The results are compared with the literature and show that this method has better convergence in different Reynolds and temperatures with changes at boundary conditions in the airfoil.