[williambwright]

I have a simple airfoil with an unstructured grid. Below are the input parameters of note.
The values are automatically generated by my python script, hence all the decimal points

FREESTREAM_VISCOSITY=1.6788979525738182e-05
FREESTREAM_DENSITY=1.3091488672524885
FREESTREAM_PRESSURE=100000
MACH_NUMBER=0.27549614255511584
AoA=3.0
FREESTREAM_TEMPERATURE=266.09781656611955
FREESTREAM_VELOCITY=( 90.09175, 0.00, 0.00 )
REYNOLDS_NUMBER=2141236.907406491
MESH_FILENAME=geom.su2

I could post the entire cfg file. When I plot the output, the ambient pressure looks to be about 30000 not 100000. What should I be looking for in the cfg file?

[kmandar]

Perhaps the non-dimensionalization used?

% Flow non-dimensionalization (DIMENSIONAL, FREESTREAM_PRESS_EQ_ONE,
% FREESTREAM_VEL_EQ_MACH, FREESTREAM_VEL_EQ_ONE)
REF_DIMENSIONALIZATION= FREESTREAM_PRESS_EQ_ONE

[williambwright]

I have
REF_DIMENSIONALIZATION= DIMENSIONAL

I thought this would man that it takes my inputs as dimensional units

[hlk]

Originally Posted by williambwright

I have a simple airfoil with an unstructured grid. Below are the input parameters of note.
The values are automatically generated by my python script, hence all the decimal points

FREESTREAM_VISCOSITY=1.6788979525738182e-05
FREESTREAM_DENSITY=1.3091488672524885
FREESTREAM_PRESSURE=100000
MACH_NUMBER=0.27549614255511584
AoA=3.0
FREESTREAM_TEMPERATURE=266.09781656611955
FREESTREAM_VELOCITY=( 90.09175, 0.00, 0.00 )
REYNOLDS_NUMBER=2141236.907406491
MESH_FILENAME=geom.su2

I could post the entire cfg file. When I plot the output, the ambient pressure looks to be about 30000 not 100000. What should I be looking for in the cfg file?

Thanks for your question.

Here are some things to look for when debugging this problem:
- In the console output it will list what freestream values are set, and describe how they are determined under the 'solver preprocessing' step
- Not all of the values that you have set will be used: in inviscid flow the density will be calculated from the pressure and temperature, and viscosity will not be used. In RANS or Navier stokes, the Reynolds number and the temperature are the main inputs. This is listed in the solver preprocessing output.
- Check your boundary conditions: freestream sets the initial values, and the values used in a farfield boundary condition. If you are not using the farfield boundary condition, the freestream values may only be used in initializing the flowfield.