Hi Roy, Thanks for all the help. setting the constraint to symmetric instead of the default asymmetric helped, and the convergence is again what it was. Thanks.
Subramanya G Sadasiva, Graduate Research Assistant, Hierarchical Design and Characterization Laboratory, School of Mechanical Engineering, Purdue University. "The art of structure is where to put the holes" Robert Le Ricolais, 1894-1977 On Thu, Apr 4, 2013 at 6:15 PM, Subramanya Sadasiva <[email protected]>wrote: > My code is not stabilized. Does that make a difference? > > Subramanya G Sadasiva, > > Graduate Research Assistant, > Hierarchical Design and Characterization Laboratory, > School of Mechanical Engineering, > Purdue University. > > "The art of structure is where to put the holes" > Robert Le Ricolais, 1894-1977 > > > On Thu, Apr 4, 2013 at 6:08 PM, Roy Stogner <[email protected]>wrote: > >> >> Almost forgot to Cc: libmesh-users: >> >> On Thu, 4 Apr 2013, Subramanya Gautam Sadasiva wrote: >> >> > From: "Roy Stogner" <[email protected]> >> > >> >> Are you using the symmetric or asymmetric constraints option? You >> >> might try the alternative. >> >> > Are these options for the dirichlet boundary condition objects? Or >> > are these for when I constrain the matrix at the end of assembly.. >> > (constrain_element_matrix etc.) >> >> When you constrain at the end of assembling each element. >> >> >> What are your FE variable types? >> > >> > I am using Q4 for the pressure and Q9 for the velocities. If I solve >> > without adaptivity , I have no problems and the thing works as >> > promised. >> >> I was wondering if there was some LBB stability criteria that an >> adaptive mesh might be breaking... but I used to use Q2/Q1 Taylor Hood >> elements on adapted grids all the time without running into issues >> that affected my dumb GMRES+ILU solver options. >> --- >> Roy >> >> >> ------------------------------------------------------------------------------ >> Minimize network downtime and maximize team effectiveness. >> Reduce network management and security costs.Learn how to hire >> the most talented Cisco Certified professionals. Visit the >> Employer Resources Portal >> http://www.cisco.com/web/learning/employer_resources/index.html >> _______________________________________________ >> Libmesh-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/libmesh-users >> > > ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
