Search found 17 matches

by gschrank
13 Dec 2020, 19:45
Forum: ElmerSolver
Topic: Question Regarding ElmerSolver Capabilities with Soft Limiter and Discontinious Galerkin Method
Replies: 1
Views: 1459

Question Regarding ElmerSolver Capabilities with Soft Limiter and Discontinious Galerkin Method

I've been looking for the answer to this question elsewhere. Maybe it has already been asked and answered, but I've not been able to find it. I've put together a couple User Solvers using the ModelPDE as a basis. I know that certain attributes like adaptive meshing require code in the user module to...
by gschrank
27 Nov 2020, 23:33
Forum: General
Topic: Diffusion Equation with Limited Source
Replies: 1
Views: 1548

Diffusion Equation with Limited Source

Good afternoon! I've been working on a multiphysics model that combines transport phenomena with a user solver. In the model, I am, in part, modelling the diffusion of a reactant from a sources in a reaction vessel. The source is modeled using mass transfer boundary condition with the equilibrium (i...
by gschrank
02 Nov 2020, 23:02
Forum: Bug reports
Topic: Simple Hexahedral Mesh Not Supported by Transient Simulation
Replies: 9
Views: 6278

Re: Simple Hexahedral Mesh Not Supported by Transient Simulation

Here is another quick and simple example of a case.sif with this mesh. This time using the diffusion equation, so we don't have to worry about Reynold's number or any of that stuff. We don't even have to worry about non-linearities. This is just a really simple diffusion problem where the walls are ...
by gschrank
02 Nov 2020, 22:02
Forum: Bug reports
Topic: Simple Hexahedral Mesh Not Supported by Transient Simulation
Replies: 9
Views: 6278

Re: Simple Hexahedral Mesh Not Supported by Transient Simulation

I think there is a disconnect as to what we are talking about here. It is not that the nonlinear system doesn't converge, etc. It's not even that the linear solver doesn't converge (the prescription I have in my case.sif is a direct solver anyway, so that doesn't even make sense. It is that when I r...
by gschrank
02 Nov 2020, 06:25
Forum: Bug reports
Topic: Simple Hexahedral Mesh Not Supported by Transient Simulation
Replies: 9
Views: 6278

Simple Hexahedral Mesh Not Supported by Transient Simulation

I'm using Elmer 8.4 under Ubuntu 18.04. I used gnu compilers to compile the code The simple attached 3D hex mesh will not run under transient simulations. It appears that when I switch the simulation type to transient, the solver outputs NaN for all entries in the matrix. The solver produces real va...
by gschrank
12 Sep 2020, 01:56
Forum: Bug reports
Topic: Specific Heat Ratio Does Not Accept Input from UDF
Replies: 1
Views: 3082

Specific Heat Ratio Does Not Accept Input from UDF

I am using Elmer 8.4 on Ubuntu 18.04 LTS. Elmer is complied using gfortran. I have written a User Defined Function to calculate the specific heat ratio for a multi-component system for use with the Navier-Stokes "Flow" Solver. The solver will run just fine when I put a number for Specific ...
by gschrank
18 Jul 2020, 20:50
Forum: Software development
Topic: Directly Setting Dirichlet BCs Using Something Other than the Solution Variable
Replies: 0
Views: 7254

Directly Setting Dirichlet BCs Using Something Other than the Solution Variable

Good morning! I am attempting to rewrite a module I had written to make it more user-friendly for my community. I had originally written the model with a very complex SIF file and all sorts of MATC code. I'm in the process of rewriting the solver so that it is both less cumbersome and conforms to cu...
by gschrank
26 Feb 2019, 06:33
Forum: General
Topic: Using Body Force to Simulate Convection in a Navier-Stokes Problem
Replies: 2
Views: 2618

Re: Using Body Force to Simulate Convection in a Navier-Stokes Problem

Sorry for my delayed reply. :oops: The case sifs can be found on my git repo here: https://github.com/drschrank/elmerfem The case sif are under misc/SEOPsifs. The most recent sifs that are used in this study are XePolIncomp.sif and XePolPerGas.sif. There's a fair amount of preamble that uses MATC to...
by gschrank
18 Feb 2019, 17:28
Forum: General
Topic: Using Body Force to Simulate Convection in a Navier-Stokes Problem
Replies: 2
Views: 2618

Using Body Force to Simulate Convection in a Navier-Stokes Problem

Good morning! I've been working on a relatively complex 3D multi-physics problem using Elmer for a few years now. I've been studying a particular geometry during those years, and I've recently modified the geometry to a slightly larger scale. RbGeometry.png The original geometry is posted above (ign...