Hello, I have a question regarding the coupling of my OpenFOAM turbulence model and my nutils heat conduction problem. The case is a steady state, incompressible case. I am already solving my velocity and pressure field beforehand in OpenFOAM and using it as an input, for the coupled case. In the c…

[image] CarsvO: Currently I am only calling nutils every 100th iteration by setting the time window size on 100 and the max-time-windows on 50 (in total I am running the openfoam model for 5000 iterations). I guess additionally you use a pseudo timestep of 1 in OpenFOAM and a pseudo timestep …

Hello, Thank you for your answer! That makes things clearer. Indeed in this case it would be possible to solve all Temperature equations linear and solve the temperature in Nutils. However in the case if we would like to go to a compressible solver, this will change and this method is probably requ…

Hey, I have an extra question about the implicit coupling you suggested. I have started playing around with it, since I think the implicity scheme will be more stable. I have done the tutorial and have tried some things out myself with a case, however I am not fully understanding how the convergenc…

Or should this be a seperate thread?

[image] CarsvO: For implicit coupling, the tags first and second do not only determine the order of execution (for serial coupling), but they also determine where preCICE computes the convergence measures and the acceleration: Both are executed on the second participant. Does this then mean tha…

[image] uekerman: The convergence measure is checked within the advance call of the second participant and then sent to the first participant. From a user perspective it makes no difference whether the first or the second participant does this (other than some minor increased computational load …

@CarsvO did you manage to solve this issue? If yes, please mark one of the posts as a solution. If not, no problem, just let us know to keep this under the radar. :slight_smile:

Hey @Makis , Sorry, I forgot about this post. Yes, I have solved it. I am using a multi-coupling scheme when coupling 2 other solvers to my Openfoam solver. I am not getting any errors anymore. I have another post, with another question, however the error I got here was solved with that post. I will…

Thank you, @CarsvO . I guess you are referring to this topic: Instability in parallel coupling scheme If the answer is the same in both, answer there. If these are two different issues, please post the one answer here and the other in the other topic. I am sorry if I may be overseeing something at t…

@Makis , yes indeed I am refering to. [image] Makis: Instability in parallel coupling scheme I hope I have the answer this week and I will post a small summary of what the solution turned out to be.

Coupling a non-linear and linear solver

Using preCICE

uekerman March 24, 2021, 9:51am 12

There is an answer in Instability in parallel coupling scheme.

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Coupling a non-linear and linear solver

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