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Definition of viscous force in UDF

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Old   April 26, 2022, 13:49
Question Definition of viscous force in UDF
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Jakub Vaverka
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Hello everyone,

I am writing my master thesis and I am trying to simulate 1DOF oscilations of different cross-sections. To do so, I am using 6DOF UDF (as can be seen below in attached img), but the definition of viscous force (F_STORAGE_R_N3V(f, t, SV_WALL_SHEAR)) gives me SIGSEGV error everytime I try to start the calculation. If I commented the viscous force out (as seen in attached image of udf) it works well.

My supervisor says this definition of viscous force worked for him last year for different project, but doesnt work now. I am using Fluent 2021 R2, but i dont think its version related problem.

Does anyone have similar issues or can somebody help me how to get the viscous force work?

Thanks in advance and if anyone has any questions or more details is needed, feel free to ask.
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