[gittagawa]

Hello everyone,

What happens when we have a commented line in SU2? I know it is ignored, but what if it is a mandatory option? What does it happen in the following example?

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

It seems to me that the first option is chosen (DIMENSIONAL). If so, is it always like that?

Thank you for considering my request.

Best regards,

Gittagawa

[fpalacios]

Yep! dimensional, is the default value for REF_DIMENSIONALIZATION. But I'm not personally a particular fan of that. Some slope limiters and numerical methods work better if the solver uses non-dimensional values.

By the way, if you are interested in developing SU2, this webpage www.su2devsociety.org is going to be the reference for the developers.

Best,
Francisco

[gittagawa]

Hello Francisco,

Thank you for your response. I did a test using both configurations, and I noticed the results are slightly different, as you can see in the enclosed picture.

[Strat1994]

Originally Posted by fpalacios

Some slope limiters and numerical methods work better if the solver uses non-dimensional values.

Francisco,

Could you expand on this comment? Which limiters and numerical methods have you found (in SU2 or in general) to work better using non-dimensional values cf. dimensional values assuming that machine precision is small enough?

Thanks,
Andy