moving mesh

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Author Message   Mauro Chierici Lopes (chierici) New member Username: chierici Post Number: 2 Registered: 01-2006 Posted on Thursday, January 12, 2006 - 07:44 am:    Hi, I want to setup a moving mesh problem with the following characteristics: a) the boundary velocity depends on another scalar variable. b) the displacement of the moving boundary is allways normal to the boundary. Thank you.   Mauro Chierici Lopes (chierici) Member Username: chierici Post Number: 5 Registered: 01-2006 Posted on Thursday, January 12, 2006 - 12:25 pm:    I start by setup a simple problem but I had problems 1.5 K cottrel_pseudo2D.pde "simple moving mesh" . The program runs for constant boundary velocity, but when the velocity is linked to another variable it does not converge. How can I solve this problem? Thank You   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 516 Registered: 06-2003 Posted on Thursday, January 12, 2006 - 04:05 pm:    For some reason your upload has not linked correctly. I cannot download it. Please try again.   Mauro Chierici Lopes (chierici) Member Username: chierici Post Number: 6 Registered: 01-2006 Posted on Thursday, January 12, 2006 - 04:15 pm:    I hope that it functions this time. simple moving mesh cottrel_pseudo2D_movingmesh.pde (1.5 k) Thank you.   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 519 Registered: 06-2003 Posted on Thursday, January 12, 2006 - 05:12 pm:    I'm not sure what you mean by "does not converge". There are interpolation errors ~0.001 (ERRLIM) in C on the boundary. You feed these back multiplied by 148 through I into the boundary flux of C. So there is significant noise in all the boundary values. Is this what you mean by "does not converge"? In the attached file, I have used the average C across the interface to define I, and everything is smooth. 1.9 K cottrel_2.pde ""   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 520 Registered: 06-2003 Posted on Thursday, January 12, 2006 - 05:15 pm:    Resent file: 1.9 K cottrel_2.pde ""   Mauro Chierici Lopes (chierici) Member Username: chierici Post Number: 8 Registered: 01-2006 Posted on Friday, January 13, 2006 - 06:13 am:    Yes. This is my problem. The noise in c amplified in I causes irregular displacement of the interface. I can't download your upload. Please, resent it or tell me how to obtain the average C. Thank You.