A dynamic mesh quastion(please answer)
I'm using dynamic mesh to make a moving pipe ,the wall is defined as a rigid body ,the cells are hexahedral ,and I have used symmetry BC.
In previewing the motion just the wall moves and fluid interior cells get deformated and it creates negative volumes. I have used bellow command to turn on the Spring-Based Smoothing method: > (rpsetvar 'dynamesh/spring/all-element-type? #t) > dynamesh/spring/all-element-type? but nothing changed. Maybe the settings that I put in dynamic parameters panel aren't correct , please please help me to solve this problem. Thank you in advance. svh |
Re: A dynamic mesh quastion(please answer)
Hi For dynamic mesh moment, fluent gives us three methods(spring, layering , local remeshing). You had better use the spring and layering method to resolve your problems. If you can minish the time step of every literate, I think the negative volumes may be disappear.
lyf |
Re: A dynamic mesh quastion(please answer)
Thank you lyf, the time step that I use is .01(s),is it big?
Is the form of mesh effective in moving? Thanks again. svh |
Re: A dynamic mesh quastion(please answer)
Hi! svh
The time step* velocity <= the Cell Height on adjacent zone. try to do it ! lyf |
Re: A dynamic mesh quastion(please answer)
Hi!
My velocity function is : vel[2] = 0.0628*cos(6.28*time) (metric system) My time step size = .01 (s) Cell Height = 2 mm So time step size is not big ,Dear lyf is any thing else effective on moving ,like making active Sping Smoothing or the mesh? Grate thanks. |
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