## Search found 5 matches

18 Jul 2016, 19:48
Forum: General
Topic: Time dependent Boundary Conditions
Replies: 9
Views: 7584

### Re: Time dependent Boundary Conditions

Hi Matthias, Thank you for your reply. The thing is that I don't want to prescribe a "MyVar = 0" Dirichlet BC after Time = 3, but a no-flux boundary condition (natural BC), i.e. the simplest Neumann BC. Such a no-flux boundary condition is accomplished naturally when no Dirichlet BC is pre...
14 Jul 2016, 19:41
Forum: General
Topic: Time dependent Boundary Conditions
Replies: 9
Views: 7584

### Re: Time dependent Boundary Conditions

Hello everybody, I was wondering if it is possible to prescribe a Dirichlet boundary condition up to a time and then release it, so that it becomes a no-flux "natural" boundary condition. I've tried MyVar= Variable Time; Real MATC "if(tx<3) 1" But it crashes after Time=3. I've al...
05 Jul 2016, 23:20
Forum: Software development
Topic: Solutions at time steps n and n-1
Replies: 3
Views: 4445

### Re: Solutions at time steps n and n-1

Hello, Thank you both. I am using BDF of order 1. Therefore, I have tried the following, but it still doesn't work: Add the integer variable StoreSteps to the type Solver_t in the file Types.F90 (line 721). Add the keyword to SOLVER.KEYWORDS Simulation:Integer: 'BDF Store Steps' Read the value from ...
25 Jun 2016, 01:56
Forum: Software development
Topic: Flux Corrected Transport in Elmer
Replies: 2
Views: 5448

### Re: Flux Corrected Transport in Elmer

Hello Peter, I was just implementing the FCT Method in Elmer for an advection dominated problem that I have (Chemotaxis+Haptotaxis), when I saw your post of 2013!! :) I have so many questions: Have you worked further on this? Is FCT already available for parallel computing in Elmer? I have actually ...
23 Jun 2016, 22:42
Forum: Software development
Topic: Solutions at time steps n and n-1
Replies: 3
Views: 4445

### Solutions at time steps n and n-1

Dear Elmer team, I am writing a solver for a system of 12 coupled PDEs. Since some of my equations are advection-dominated, I am implementing an FCT-stabilization algorihm, which needs the solutions at time steps n and n-1 in order to calculate the flux corrections and solve the system at time step ...