rajurubd@yahoo.com [COMSOL_Users]
2014-07-02 17:03:14 UTC
I have create a model for steady flow in subsurface flow using Brinkman equation and Heat transfer in porous media in COMSOL 4.3. The program is ok and streamlines and isotherms shows desired result. But I am suffering the following problems:
1. When I entering the heat generation parameter greater than 7 it shows the following message:
"Failed to find a solution for all parameters,
even when using the minimum parameter step.
No convergence, even when using the minimum damping factor.
Returned solution is not converged"
2.After exporting the image of isotherm and streamline, it shows very bad picture quality and after printing the image it is very tough to understand. I have tried by increasing the resolution but is does the same. How can I get a good image?
3. The most important quarry is, if I convert the model from steady flow(Stationary) to unsteady flow (Time dependent) remaining the same data, I am failing to get the same streamline and isotherm. Where is the problem? How can I get the same result in unsteady flow?
I know unsteady flow works with change of time.
I think it would be great if you show the image for both steady and unsteady flow. But there is no option to upload a file.
1. When I entering the heat generation parameter greater than 7 it shows the following message:
"Failed to find a solution for all parameters,
even when using the minimum parameter step.
No convergence, even when using the minimum damping factor.
Returned solution is not converged"
2.After exporting the image of isotherm and streamline, it shows very bad picture quality and after printing the image it is very tough to understand. I have tried by increasing the resolution but is does the same. How can I get a good image?
3. The most important quarry is, if I convert the model from steady flow(Stationary) to unsteady flow (Time dependent) remaining the same data, I am failing to get the same streamline and isotherm. Where is the problem? How can I get the same result in unsteady flow?
I know unsteady flow works with change of time.
I think it would be great if you show the image for both steady and unsteady flow. But there is no option to upload a file.