Register Blogs Members List Search Today's Posts Mark Forums Read

 October 14, 2004, 12:19 A dynamic mesh quastion(please answer) #1 svh Guest   Posts: n/a 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

 October 15, 2004, 02:27 Re: A dynamic mesh quastion(please answer) #2 lyf Guest   Posts: n/a 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

 October 15, 2004, 05:19 Re: A dynamic mesh quastion(please answer) #3 svh Guest   Posts: n/a 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

 October 17, 2004, 22:24 Re: A dynamic mesh quastion(please answer) #4 lyf Guest   Posts: n/a Hi! svh The time step* velocity <= the Cell Height on adjacent zone. try to do it ! lyf

 October 18, 2004, 02:59 Re: A dynamic mesh quastion(please answer) #5 svh Guest   Posts: n/a 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.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post cardio FLUENT 1 May 20, 2014 08:41 DarrenC ANSYS Meshing & Geometry 11 August 5, 2013 06:42 wlt_1985 FLUENT 1 July 28, 2011 01:53 BillH FLUENT 4 July 24, 2007 15:31 nasser FLUENT 0 November 1, 2005 03:37

All times are GMT -4. The time now is 05:53.