Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
solving a two model problem
Posted 20.01.2011, 05:48 GMT-5 Version 3.5a 1 Reply
Please login with a confirmed email address before reporting spam
Hello everybody,
i am new to comsol and i have a problem with my model.
It is a problem that uses General Heat Transfer getting the value of a heat source (Q) from a Perpendicular Induction Currents model.
The problem is that, when i ask it to solve the problem for both models then i get at time zero (transient analysis) a temperature that is non-zero (and quite big) and that makes no sense.
However, when i solve it for General Heat Transfer model only it runs correct.
any idea why is this happening?
i am new to comsol and i have a problem with my model.
It is a problem that uses General Heat Transfer getting the value of a heat source (Q) from a Perpendicular Induction Currents model.
The problem is that, when i ask it to solve the problem for both models then i get at time zero (transient analysis) a temperature that is non-zero (and quite big) and that makes no sense.
However, when i solve it for General Heat Transfer model only it runs correct.
any idea why is this happening?
1 Reply Last Post 20.01.2011, 09:07 GMT-5
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
this might be linked to an initial condition (but might also be something else ;) So I usually check my initial conditions by
v3.5a: Solve - Get initial conditions
v4.x right clicking the "solver sub-node": "Dependent vaiables" and select "compute to here"
Then I look at my initial conditions, and adjust if possible to get a shape that already looks like my result (with linear gradients etc. becausestarting all from "0" is often rather tough for the solver), furthermore this gives me indications when a BC is missing or that I have made singularity regions/points
--
Good luck
Ivar
this might be linked to an initial condition (but might also be something else ;) So I usually check my initial conditions by
v3.5a: Solve - Get initial conditions
v4.x right clicking the "solver sub-node": "Dependent vaiables" and select "compute to here"
Then I look at my initial conditions, and adjust if possible to get a shape that already looks like my result (with linear gradients etc. becausestarting all from "0" is often rather tough for the solver), furthermore this gives me indications when a BC is missing or that I have made singularity regions/points
--
Good luck
Ivar