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Synthetic boundary condition for compressible near wall turbulence

Abstract : Direct Numerical Simulation of turbulent boundary layers requires a high spatial resolution specially near the wall to capture the different length scales inherent of turbulence. To reduce the computing cost related to the high spatial resolution, we investigate techniques that bypass the wall region by using an artificial boundary condition at the bound of a reduced computational domain. A reconstruction strategy based on POD is implemented in order to generate synthetic boundary conditions such that the correct spatial characteristics and dynamics of the turbulence are recovered in the core region of the channel. The boundary condition was tested at two different heights. Statistics in the reduced channel were compared with those of a reference case. A good agreement is observed for the mean velocity profile and the turbulent shear stress. The procedure was found to be robust with the boundary height and results in a drastic computational cost reduction.
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Submitted on : Thursday, January 2, 2020 - 1:44:05 AM
Last modification on : Wednesday, September 16, 2020 - 5:35:44 PM


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  • HAL Id : tel-02426246, version 1


Ye Hong. Synthetic boundary condition for compressible near wall turbulence. Mechanics of the fluids [physics.class-ph]. Université Paris-Saclay, 2019. English. ⟨NNT : 2019SACLS262⟩. ⟨tel-02426246⟩



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