Hey all,
I'm working on a 3D model of a microfluidic system using the laminar flow (spf) and transport of diluted species (chds) physics models. I've got everything modeled with all the physics settings done, and the mesh applies quickly, but when I set it to solve, it errors out saying:
"Error: Problem setting up multigrid"
Looking through the model the error appears to be when the solver creates a coarser mesh in order to get a simpler solution, the "coarse" mesh has elements too large for the geometry and so it errors out. To give an idea of what I'm working with, the microfluidic channel is 301um x 6000um x 110um with microcantilevers that are 300um x 45um x 1um in the middle.
I know this will be a very intensive model; I have a Core i7 system with 16GB of RAM dedicated to this (as well as about 200GB of virtual memory). The problem is it never even gets to needing any of that RAM (gets to about 500 MB working set and 500 MB virtual) and just errors out trying to simplify the mesh. (Or at least that's my understanding.)
Is there anything I can do to get it to stop with the multigrid preconditioner, or get it to push through it? I'm using Comsol 4.0a, and have a copy of Comsol 4.1 that I haven't upgraded to yet, so if there's a solution that needs 4.1 I can update my system.
Thanks for any advice.
I'm working on a 3D model of a microfluidic system using the laminar flow (spf) and transport of diluted species (chds) physics models. I've got everything modeled with all the physics settings done, and the mesh applies quickly, but when I set it to solve, it errors out saying:
"Error: Problem setting up multigrid"
Looking through the model the error appears to be when the solver creates a coarser mesh in order to get a simpler solution, the "coarse" mesh has elements too large for the geometry and so it errors out. To give an idea of what I'm working with, the microfluidic channel is 301um x 6000um x 110um with microcantilevers that are 300um x 45um x 1um in the middle.
I know this will be a very intensive model; I have a Core i7 system with 16GB of RAM dedicated to this (as well as about 200GB of virtual memory). The problem is it never even gets to needing any of that RAM (gets to about 500 MB working set and 500 MB virtual) and just errors out trying to simplify the mesh. (Or at least that's my understanding.)
Is there anything I can do to get it to stop with the multigrid preconditioner, or get it to push through it? I'm using Comsol 4.0a, and have a copy of Comsol 4.1 that I haven't upgraded to yet, so if there's a solution that needs 4.1 I can update my system.
Thanks for any advice.