Search found 3660 matches

by raback
Yesterday, 18:29
Forum: General
Topic: Heat radiation
Replies: 8
Views: 112

Re: Heat radiation

Could you please specify how you learned to work with Elmer? How do you solve an issue? Well, I coded large parts of the code. If I have an issue I code some more ;-) This is a small open source project and this support is pro bono. Commercial codes are there for a purpose as they can have an army ...
by raback
Yesterday, 01:49
Forum: ElmerSolver
Topic: Local Displacement in StressSolve.f90
Replies: 3
Views: 25

Re: Local Displacement in StressSolve.f90

DefaultSolve() is usally the routine that solves for the linear system + does some relexation + checks for convergence. The modules usually just do the physics specific stuff i.e. discretize the PDEs into linear systems. -Peter
by raback
03 Jul 2020, 10:29
Forum: General
Topic: Heat radiation
Replies: 8
Views: 112

Re: Heat radiation

Hi Have you read the chapter for HeatSolver in Elmer Models Manual? I know the documentation is limited but >700 pages still something. It just reflects the width of the application fields. Heat transfer is just one of many. There are no units specified since the user can choose whatever consistent ...
by raback
03 Jul 2020, 09:46
Forum: ElmerSolver
Topic: Turbulent Flow Simulations with Elmer - A Request
Replies: 18
Views: 1348

Re: Turbulent Flow Simulations with Elmer - A Request

Hi All, I've been working a little with this turbulence stuff the last two days. Some baby steps taken. So far I'm taking some ideas from: http://num.math.uni-goettingen.de/bail/documents/proceedings/mierka.pdf The work happens on branch "KESolverRevisit". What I've been trying to do is to gradually...
by raback
02 Jul 2020, 19:28
Forum: General
Topic: Membrane stretching due to negative pressure in a "microfluidic" device
Replies: 3
Views: 48

Re: Membrane stretching due to negative pressure in a "microfluidic" device

Sure, for example

Code: Select all

  $a=1.23
  $w=4.56
  Normal Force = Variable time
    Real MATC "a*sin(wt)"
-Peter
by raback
02 Jul 2020, 00:51
Forum: ElmerSolver
Topic: Local Displacement in StressSolve.f90
Replies: 3
Views: 25

Re: Local Displacement in StressSolve.f90

Hi

This routine just picks the local displacements related to an element from the global solution vector. So there is no solution step required.

-Peter
by raback
01 Jul 2020, 14:35
Forum: ElmerSolver
Topic: Gmsh + Elmer - Strange result depending on mesh type
Replies: 21
Views: 168

Re: Gmsh + Elmer - Strange result depending on mesh type

Hi Kevin,

Yes, I realized there was a bug introduced. Quick tests were passed but many others were not.

The current devel version hopefully works better. Last commit was just minutes ago.

Thanx for testing & reporting!

-Peter
by raback
01 Jul 2020, 11:35
Forum: General
Topic: Membrane stretching due to negative pressure in a "microfluidic" device
Replies: 3
Views: 48

Re: Membrane stretching due to negative pressure in a "microfluidic" device

Hi

If you know the pressure of the fluid domains there is no need to mesh them. Just apply "Normal Force" (same unit as for pressure) on the fluid walls.

-Peter
by raback
30 Jun 2020, 12:41
Forum: General
Topic: Heat radiation
Replies: 8
Views: 112

Re: Heat radiation

Hi

It is indeed better to start with "idealized". That should usually work easily. However, that will give you no heat exchange between bodies.

You don't seem to have the ViewFactors binary in your path.

-Peter
by raback
30 Jun 2020, 01:40
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 7
Views: 77

Re: Complicate Noise Source Input in Acoustic Analysis

Hi

The difference is that in PDEs the "bofy force" is typically a source term integrated over volume and the "boundary condition" often comes from the weak formulation and is integrated over the boundary area.

When using nodal loads an discrete level these are more alike.

-Peter