code_saturne User's Forum

Thank you for the comprehensive reply. That's very useful, i hope to persuade more people in my organisation of the benefits of Open Source.

I'm interested in the history behind Code Saturne. I work in a British research organisation attached to a university and I'm interested in the way that EDF has made several very useful softwares (e.g Salome/Code Saturne/Code Aster) Open Source. I think this is something we could learn from. So why ...

Actually if I set the number of processes to 16 and threads to 1 then I get the error "There are not enough slots available in the system to satisfy the 16 slots that were requested by the application:" However I have run it with 4 processes and 1 thread per process (running the original c...

Sorry, I'm not clear what you mean here. I'm on a machine with 4 physical cores and 4 threads per core. So are you saying that in the "Run Simulation" window I should try "Number of processes" to 4 and "Threads per process" to 1?

I have tried reducing the reference time step to 0.001 (in Steady Local Time Step mode), but this made almost no difference to the final result. I also tried reducing the Maximal CFL number to 0.1, but then it failed to solve. If you have any more cases you want me to run then I'd be happy to.

OK, so I have tried again using Steady (local time step),, with the reference time step set to 0.01, everything else left default (Maximal CFL number 1.0, Maximal Fourier number 10.0, Minimal time step factor 0.1, Maximal time step factor 1000, Time step maximal variation 0.1). Now I do get better r...

Very odd! I don't get the same result. Smooth wall on the wing surface, k-epsilon turbulence (what do you mean by "default wall law"?) and I get the attached lift and drag file (I've also attached the setup.xml file). This gives a final lift of 408.24N (which matches the Paraview calculate...

Sorry, can't work out how to format a table to post here. Here are the results in a bit more readable way:

Hi there, I've tried it with kε, kωSST and with rough (height 0.0001m) and smooth walls. All do seem to converge for me within the 500 steps of 0.05s. Here's the plot of kε with a smooth wall: K-e.png kωSST does seem to converge quicker for the smooth wall case: K-om-SST-smooth.png However for the r...

Ah, thank you, yes I hadn't noticed that the stress had x, y and z components. Now by integrating them on the wing surface I do get figures for lift and drag. Unfortunately they don't seem right! I've been using Siemens Star CCM+ at work but am looking for something that I can use for my own non-wor...