CFD Online Discussion Forums - SU2_EDU version solution not converging..

Quote:

Originally Posted by akanoria (Post 477527)

Hi,

I was trying to use this new release of SU2_EDU. I am very new using SU2. Following is my two dimensional case setup:

Re = 500
Ref Length = 0.6 m
Kinematic Viscosity = 1.2E-4 m2/s
Density = 1 kg/m3
Velocity = 0.1 m/s
Model: NACA 63415

I am using RANS config file. My solution is not converging. The calculated Mach no. is 0.0002.
I am not able to edit the reference viscosity. Can you please guide necessary changes for this setup

First of all, thanks for using SU2_EDU.

As you know, 0.0002 is a very small Mach number for a compressible solver. Could you please try the same problem with Mach number 0.01? be sure that you are using SU2_EDU 1.1

The non-dimensionalization described in http://su2.stanford.edu/documents/SU2_AIAA_ASM2013.pdf or you can check the lines of the code from 2947 to 2963 in config_structure.cpp. The non-dimensionalizaton works as follow with the temperature SU2 computes the viscosity, with the viscosity and the reynolds number and reynolds lengths the code compute the density... and with the density and temperature you determine the pressure. the velocity is computed with the speed of sound(from temperature) and mach number.

If the SU2_EDU (compressible) code doesn't work, then you should use the complete suite SU2 and use the incompressible solver just setting the following in the config file.

REGIME_TYPE= COMPRESSIBLE

% -------------------- INCOMPRESSIBLE FREE-STREAM DEFINITION ------------------%
%
% Free-stream density (1.2886 Kg/m^3 (air), 998.2 Kg/m^3 (water))
FREESTREAM_DENSITY= 1
%
% Free-stream velocity (m/s)
FREESTREAM_VELOCITY= ( 0.1, 0.00, 0.00 )
%
% Free-stream viscosity (1.853E-5 Ns/m^2 (air), 0.798E-3 Ns/m^2 (water))
FREESTREAM_VISCOSITY= 1.2E-4

Cheers,
Francisco