CoilSolver problems with boundary layers and parallel processing
Posted: 21 Aug 2023, 17:50
Hi!
I am trying to solve a case (following this article https://hal.science/hal-01336357/document) where three AC coils are generating volume force in a metal volume. Initially I am not interested about the generated liquid metal velocity and would like to only calculate the electromagnetic part of the problem.
I have previously calculated similar cases with "MagnetoDynamics" solver by simply defining current density as a volume force. However, it is not so easy to define volume force if coils are not axially symmetrical. So for this task I decided to use CircuitBuilder and CoilSolver and followed the provided tutorial case here: https://github.com/ElmerCSC/elmer-elmag ... d/harmonic
The tutorial case runs fine with single process as well as in parallel. However, there were couple of problems with my case.
First, my case did not converge with a mesh that has boundary layers.
ERROR:: IterSolve: Numerical Error: System diverged over maximum tolerance.
Later I learned that the case converges if I use mesh without boundary layers. However, there was another problem. Turns out there is a segmentation fault error if I use parallel processing.
Backtrace for this error:
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
I used to make partitions.
Does CoilSolver support mesh with prisms?
Does someone know how to fix these problems?
Didzis
I am trying to solve a case (following this article https://hal.science/hal-01336357/document) where three AC coils are generating volume force in a metal volume. Initially I am not interested about the generated liquid metal velocity and would like to only calculate the electromagnetic part of the problem.
I have previously calculated similar cases with "MagnetoDynamics" solver by simply defining current density as a volume force. However, it is not so easy to define volume force if coils are not axially symmetrical. So for this task I decided to use CircuitBuilder and CoilSolver and followed the provided tutorial case here: https://github.com/ElmerCSC/elmer-elmag ... d/harmonic
The tutorial case runs fine with single process as well as in parallel. However, there were couple of problems with my case.
First, my case did not converge with a mesh that has boundary layers.
ERROR:: IterSolve: Numerical Error: System diverged over maximum tolerance.
Later I learned that the case converges if I use mesh without boundary layers. However, there was another problem. Turns out there is a segmentation fault error if I use parallel processing.
Backtrace for this error:
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
I used
Code: Select all
ElmerGrid 2 2 meshElmer -metis 6Does CoilSolver support mesh with prisms?
Does someone know how to fix these problems?
Didzis