Search found 196 matches

by Franz Pichler
26 Jan 2015, 13:21
Forum: ElmerSolver
Topic: GetVariable used on components is not uptodate
Replies: 3
Views: 2261

GetVariable used on components is not uptodate

Hello dear Elmer community, i have the following situation I use a solver to calculate some unknown "pot" with 2 degrees of freedom. After the solver finished i can use VariableGet(Solver%Mesh%Variables,"pot") on its Variable and there i get the two components of the unkown as ca...
by Franz Pichler
26 Jan 2015, 13:17
Forum: ElmerSolver
Topic: Point source for StatCurrentSolve
Replies: 23
Views: 12291

Re: Point source for StatCurrentSolve

Exactly, and when u think through the units of Ax=b arising from the PDE of OHms law ( -div.(sigma*grad_pot)=rhs) then the b has to have units of Ampere. which gives to possibilities for the rhs: 1) it is a source term in the volumetric meaning (-div.(sigma*grad_pot)= f) then f would have to have un...
by Franz Pichler
23 Jan 2015, 12:35
Forum: ElmerSolver
Topic: Point source for StatCurrentSolve
Replies: 23
Views: 12291

Re: Point source for StatCurrentSolve

HI, setting the "potential load" is more of Neumann BC than a Dirichlet one. And setting the nodal load at just one node is a current source that is coming from one point. The current source doesn't actually have a direction. Static Potential and current work quite analogue to a static hea...
by Franz Pichler
21 Jan 2015, 11:47
Forum: ElmerSolver
Topic: Point source for StatCurrentSolve
Replies: 23
Views: 12291

Re: Point source for StatCurrentSolve

Aren't the potential load and the current density the same thing?
by Franz Pichler
10 Dec 2014, 13:06
Forum: ElmerSolver
Topic: Evaluating equation on different bodies
Replies: 3
Views: 2103

Re: Evaluating equation on different bodies

very smart, very true,
i was not thinking of iterative solvers enough,

thanks peter ;)
by Franz Pichler
09 Dec 2014, 14:48
Forum: ElmerSolver
Topic: Evaluating equation on different bodies
Replies: 3
Views: 2103

Re: Evaluating equation on different bodies

Hello, Thinking about my own post i just had the idea that maybe the passive/active elements feature could be a solution to my problem. So i could give every subdomain its own body index and then in the solver switch only elements of one body to active somehow. Would that actually make the system ma...
by Franz Pichler
09 Dec 2014, 11:48
Forum: ElmerSolver
Topic: Evaluating equation on different bodies
Replies: 3
Views: 2103

Evaluating equation on different bodies

HI dear elmer community, after a long time i ahve some questions again. So my situation is the following: 1) I solve the heat equation (my own implementation of it, but very standard) on my whole model domain. 2) The heat sources come from another solver that calculates some kind of joule heat, so i...
by Franz Pichler
11 Aug 2014, 11:37
Forum: ElmerGUI
Topic: Thermal simulation - multiple bodies
Replies: 12
Views: 12553

Re: Thermal simulation - multiple bodies

Hello, i had a typo in my earlier post, i meant to write "direct solver" not "directz" solver. So instead of using an iterative solver, using a direct one. And regarding mzenkers last post: Don't hesitate to correct me here if i am wrong but isn't the Dirichlet boundary a heat si...
by Franz Pichler
05 Aug 2014, 15:41
Forum: ElmerGUI
Topic: Thermal simulation - multiple bodies
Replies: 12
Views: 12553

Re: Thermal simulation - multiple bodies

HI there,

have you tried using a directz solver and see if that gets a solution?

And i think the initial condition is also influencing the steady state simulation.
It is the initial guess for the iterative linear solver. So maybe putting it to 120 improves the convergence.

best regards
Franz
by Franz Pichler
29 Jul 2014, 11:33
Forum: ElmerSolver
Topic: Symmetric coordinates and User defined Solvers
Replies: 2
Views: 2633

Re: Symmetric coordinates and User defined Solvers

Hello Peter, Thanks for the answer. Okay so as i understand the metric information gathered by "CALL CoordinateSystemInfo( Metric,SqrtMetric,Symb,dSymb,x,y,z )" is taken care of the coordinate trasnformation for cylindrical coordinates so for example simple diffusion in cartesian coordinat...