In this numerical work, two dimensional supersonic laminar flow past moving ramp is simulated. The compression ramp starts to move from 0 to 10 degree wedge angle at constant angular speed, and when the wedge angle reaches the final wedge angle, the ramp ceases moving. Three cases of different angular speed and four cases of different Reynolds number have been simulated to examine the effect of those parameters on unsteady behavior of the flow.
To solve the two dimensional compressible Navier-Stokes equation, a finite volume method with 2nd order AUSM scheme is employed for spatial derivatives, anda Point SGS implicit method is employed for time integration. To prevent numerical errors, geometrical conservation law (GCL) is solved along with the flow conservation laws.
A distinct unsteady behavior was observed as the ramp moves. An apparent wall pressure jump greater than that of steady state was observed. The separation bubble around the corner evolves gradually as the ramp moves, and continues to grow to reach its final state after the ramp stops moving.