CFD Online Discussion Forums - Unexpected shock reflection from supersonic outlet

Hello,

I am using SU2 to simulate a Mach 2 steady laminar shock-boundary layer interaction problem. To generate the shock, I have imposed pre- and post-shock conditions (using MARKER_SUPERSONIC_INLET) on two parts of the top boundary. To prevent the reflection of leading edge shock, for the third part of the top boundary, I have given the MARKER_SUPERSONIC_OUTLET condition. I am listing the config file here.

Code:

SOLVER = NAVIER_STOKES



VISCOSITY_MODEL= SUTHERLAND



REYNOLDS_NUMBER = 1E5

REYNOLDS_LENGTH = 80E-3

MACH_NUMBER = 2.15

FREESTREAM_OPTION = TEMPERATURE_FS

FREESTREAM_PRESSURE = 1117.3

FREESTREAM_TEMPERATURE = 157

FREESTREAM_VELOCITY = (540, 0, 0)



MESH_FILENAME = mesh2_62x53.su2

MESH_FORMAT = SU2

MARKER_EULER = (front_back)

MARKER_HEATFLUX = (wall, 0.0)

MARKER_SUPERSONIC_INLET = (preshock_inflow, 157, 1117.3, 540, 0, 0, postshock_inflow, 167.284, 1393.6, 520.562, -34.6182, 0)

MARKER_SUPERSONIC_OUTLET = (outflow_top)

MARKER_OUTLET = (outflow_side, 1718.81)



CONV_NUM_METHOD_FLOW = SLAU2



INIT_OPTION = REYNOLDS

TIME_DOMAIN = YES

TIME_MARCHING = TIME_STEPPING

TIME_DISCRE_FLOW = RUNGE-KUTTA_EXPLICIT

UNST_CFL_NUMBER = 0.5

MAX_TIME = 8e-3

TIME_ITER = 1000000000



OUTPUT_WRT_FREQ = 10000

SCREEN_WRT_FREQ_TIME = 1000

HISTORY_WRT_FREQ_TIME = 100

SCREEN_OUTPUT = (CUR_TIME, TIME_STEP, TIME_ITER, RMS_DENSITY)

HISTORY_OUTPUT = (CUR_TIME, TIME_ITER, RMS_RES)

However, I am still seeing the reflection of the leading edge shock from the top boundary (attached figure temp.png). It reflects onto the bottom boundary (a wall) and therefore disturbs the flow there, thereby hampering the wall pressure comparison with reference data.

Is there anything I can do to prevent the reflection of leading edge shock? Please let me know in case any additional information is required.

Thanking in anticipation,
Vachan