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
