2D simulation

Parameters chosen for the 2D simulation are :
— Mach number 0.1285
— Reynolds 166 000
— Gas constant 43.25
— Timestep 0.00845
— CFL 1
— residue variable : density
— Tolerance 1e − 4
— Time scheme : implicit
— space scheme : centered

Eventually, we used a mesh where the second cylinder is free, enabling it to move axially upwards. This configuration represents the movement of cylinders in nuclear power plants in the coolant circuit. The following animation is what we have obtained with Tecplot, during one period ( 1000 snapshots ), with u* = 4 which is a supercritical regime.