Wall-modeling for large-eddy simulation of flows around an axisymmetric body using the diffuse-interface immersed boundary method
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A novel method is proposed to combine the wall-modeled large-eddy sim-ulation (LES) with the diffuse-interface direct-forcing immersed boundary (IB) method. The new developments in this method include: (i) the momentum equation is integrated along the wall-normal direction to link the tangential component of the effective body force for the IB method to the wall shear stress predicted by the wall model; (ii) a set of Lagrangian points near the wall are introduced to compute the normal component of the effective body force for the IB method by reconstructing the normal component of the velocity. This novel method will be a classical direct-forcing IB method if the grid is fine enough to resolve the flow near the wall. The method is used to simulate the flows around the DARPA SUBOFF model. The results obtained are well comparable to the measured experimental data and wall-resolved LES results.
Key wordswall model large-eddy simulation (LES) immersed boundary (IB) method diffuse-interface
Chinese Library ClassificationO357
2010 Mathematics Subject Classification76A60 76D05 76F65
The author Xiaolei YANG would like to acknowledge the hospitality received at LNM during his visit where he accomplished this work. The computations are conducted on Tianhe-1 at the National Supercomputer Center in Tianjin.
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