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Finite-difference immersed boundary method consistent with wall conditions for incompressible turbulent flow simulations. (English) Zbl 1173.76374

Summary: An immersed boundary method to achieve the consistency with a desired wall velocity was developed. Existing schemes of immersed boundary methods for incompressible flow violate the wall condition in the discrete equation system during time-advancement. This problem arises from the inconsistency of the pressure with the velocity interpolated to represent the solid wall, which does not coincide with the computational grid. The numerical discrepancy does not become evident in the laminar flow simulation but in the turbulent flow simulation. To eliminate this inconsistency, a modified pressure equation based on the interpolated pressure gradient was derived for the spatial second-order discrete equation system. The conservation of the wall condition, mass, momentum and energy in the present method was theoretically demonstrated. To verify the theory, large eddy simulations for a plane channel, circular pipe and nuclear rod bundle were successfully performed. Both these theoretical and numerical validations improve the reliability and the applicability of the immersed boundary method.

MSC:

76M20 Finite difference methods applied to problems in fluid mechanics
76F65 Direct numerical and large eddy simulation of turbulence
65M06 Finite difference methods for initial value and initial-boundary value problems involving PDEs
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