I am using dynamic mesh to simulate the motion of airfoil in domain. But, when I run the fluent, the negative volume appears after some iterations. How can I solve this problem?
Hi Hamid!!
How did you define your dynamic mesh zones? Probably you forgot to set the adjacent zones to deforming so they can move along.
Also,something that may help is to type on the main screen:
/define/models/dynamic-mesh-controls/smoothing-parameter> as
spring-based smoothing for all cell types [no] yes
Best regards,
Dimitrios
What kind of motion(Lateral, horiz, rotational ), do you have BL mesh around airfoil, If yes do you apply your motion to that BL mesh.
Hi Hamid!!
How did you define your dynamic mesh zones? Probably you forgot to set the adjacent zones to deforming so they can move along.
Also,something that may help is to type on the main screen:
/define/models/dynamic-mesh-controls/smoothing-parameter> as
spring-based smoothing for all cell types [no] yes
Best regards,
Dimitrios
I agree with Dimitrios you must be careful with setting the adjacent zones to deforming so they can move along
Instead of UDF, if the motion is simple you can use profile file, which is much easier than writing UDF.
Hi Hamid!
Could you resolve the negative volume appears yet? I would like you check about the time step size if it is small enough comparing with the deformation displacement. I had the same problem like you before. So, I changed the mash sizing and time step size then it worked.
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