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Section: New Results

Low Mach number flows simulations issue

Participants : Pascal Bruel, Tarik Kousksou.

Since the targeted flows simulations (DNS) are by essence unsteady and at low Mach number, the use of a compressible solve has to be considered with great care. As a preliminary step towards the use of a fully implicit DG approach, we have joined the group of E. Dick at the Ghent University (Belgium) to help studying different aspects linked with low Mach number flow simulations [8] , [7] , [3] . The question of time consitency of the hyperbolic fluxes schemes for unsteady calculations has been dealt with and some pathological behavior of schemes such as the ones belonging to the AUSM family have been evidenced. A modification of AUSM+-up that satisfies the time-step dependency as well as the suitable scaling property of the pressure-velocity coupling evidenced has been proposed and tested [6] .