[dxdiag]

Hello everyone, can someone explain to me how the reynolds number here is 40? This is the original data from the "laminar cylinder" su2 website..

Freestream temperature = 273.15 K
Freestream Mach number = 0.1
Angle of attack (AOA) = 0.0 degrees
Reynolds number = 40 for a cylinder radius of 1 m

Re = rho*V*Diamater/dynamic visc
???

Also, when I change both Mach and Reynolds number proportional, I get wrong results like drag coefficient etc. Can someone help me on this? I'm trying to understand the dynamics of SU2 itself..

[R.K]

By default SU2 uses the Reynolds number to initialise the flow. Using the Reynolds number the density is caluclated, and then the pressure.

You can change this to the thermodynamic properties with the option: INIT_OPTION = TD_CONDITIONS

For the thermodynamic option, the Reynolds number is calculated from the values defined in the cfg file. If the values (pressure, temperature etc) are not defined, the default values (at sea level) are used.

You can look at the console output to see what flow properties are used for the simulation, based on your config settings.

[dxdiag]

I understood that, thank you so much Are there any other pages that teaches su2 (rather than original SU2 site)?

[R.K]

I would say the "User Guide" under Docs on the SU2 website is a great place to start understanding how to write config files and set up simulations.

The tutorials and TestCases have a very broad collection of simulations - you can look at those.

Also the config_template.cfg has all of the config options you can set, have a look at this when reading the guide and tutorials/testcases.

If you've run any simulations in the past (in OpenFoam, Ansys etc), try writing those in SU2.

[dxdiag]

I've used Fluent for a long time but now I want to learn a new program. I'll take your advice into consideration, thank you so much