XiFoam dependance on initial conditions

Sarah13 · January 20, 2023, 08:57

Hi All!
I am using XiFoam solver to model flame propagation inside a rectangular cross-section, but I have observed that my solution depends a lot on the initial conditions of the case, like: mesh size, max Courant number, time step, initial values of k (turbulent kinetic energy). I am able to obtain good results for one set of conditions but as soon as I change the mesh (for grid independence study) my results change.

Has anyone else faced any similar kind of problem with XiFoam or any other solver in OpenFOAM?

If I can get any help regarding this situation, as how to proceed for grid independence study, I would be extremely grateful. By the way, I am using adaptive time step for the same.

Thanks a lot in advance!

Tobi · February 1, 2023, 07:16

Welcome to CFD. It all depends. If we change, e.g., the mesh or the numerical schemes, you will see the influence. Its normal but you should be aware which set-up you use, which parameter influences your stuff and so on.

January 20, 2023, 08:57	XiFoam dependance on initial conditions	#1
Sarah13 New Member Sarah Join Date: Jan 2023 Posts: 12 Rep Power: 3	Hi All! I am using XiFoam solver to model flame propagation inside a rectangular cross-section, but I have observed that my solution depends a lot on the initial conditions of the case, like: mesh size, max Courant number, time step, initial values of k (turbulent kinetic energy). I am able to obtain good results for one set of conditions but as soon as I change the mesh (for grid independence study) my results change. Has anyone else faced any similar kind of problem with XiFoam or any other solver in OpenFOAM? If I can get any help regarding this situation, as how to proceed for grid independence study, I would be extremely grateful. By the way, I am using adaptive time step for the same. Thanks a lot in advance!

February 1, 2023, 07:16		#2
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51	Welcome to CFD. It all depends. If we change, e.g., the mesh or the numerical schemes, you will see the influence. Its normal but you should be aware which set-up you use, which parameter influences your stuff and so on. __________________ Keep foaming, Tobias Holzmann

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