A diffuse-interface Immersed Boundary Method (IBM) for simulating high Reynolds number turbulent flows is proposed. This method uses the wall model to reduce the number of grids near the wall. To implement the wall model and boundary conditions, two auxiliary layers (a series of Lagrangian points) are set outside the wall: the outer reference layer carries out the wall model to calculate the wall shear stress, and the inner enforced layer implements boundary conditions off the wall. When the wall model is implemented, the momentum equation is integrated along the normal direction of the wall, such that the tangential velocity correction is related to the wall shear stress obtained by the wall model, and the normal component of the velocity is approximately reconstructed according to the parabolic distribution. Furthermore, when implementing boundary conditions, we adopt the implicit velocity correction-based IBM to satisfy the non-penetration condition. Finally, the feasibility of this method is verified by numerical simulation of the turbulent flows around the flat plate and the NACA0012 airfoil.
DU Yinjie
,
SHU Chang
,
YANG Liming
,
WANG Yan
,
WU Jie
. Wall model based diffuse-interface immersed boundary method and its application in turbulent flows[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(S1)
: 726361
-726361
.
DOI: 10.7527/S1000-6893.2021.26361
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