Application of immersed boundary based turbulence wall modeling to the Ahmed body aerodynamics

This paper applies a recently developed immersed boundary-turbulence wall modeling approach to turbulent flows over generic car geometry, known as the Ahmed body, under massive flow separation within lattice Boltzmann solver. Although boundary method combined with hierarchical Cartesian grid offers high flexibility in automatic generation around complex geometries, near-wall solution is significantly deteriorated compared body-fitted simulation, especially when coupled models for at Reynolds number. Enhanced treatments have been proposed literature and validated attached configurations. In this work, body slant surface of angle [Formula: see text] considered where separates massively vertical base. The large eddy simulation performed stress constraint near-wall. viscosity computed dynamically by taking into account actually resolved stresses. It approaches mixing length layers returns subgrid detached layers. An explicit equilibrium model has also accelerate calculation. Comparison no-slip condition on separated surfaces shows that operate reasonably well both