Menu

Discussion Forum

New Discussion
Filtern

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 The information provided may be out of date.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.

Dispersed phase discretization - Mixture Model, Laminar Flow

Posted 13.11.2012, 12:40 GMT-5 Computational Fluid Dynamics (CFD), Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3a 3 Replies

J
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi all,

I have a question related to the discretization of the dispersed phase in the Mixture Model, Laminar Flow interface. Under "Discretization" is only possible to choose the discretization for the fluid phase, while for the solid phase (i.e. phid) is not.

Do you know which discretization is used for the solid phase? Is it linear?

Any idea on why it is not possible to choose the discretization for the solid phase?

Thanks,

J
3 Replies Last Post 14.11.2012, 14:54 GMT-5
Nagi Elabbasi Facebook Reality Labs
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 13.11.2012, 14:09 GMT-5
In Mixture Model, Laminar Flow the discretization of phid (volume fraction of the dispersed phase) is I believe the same as the fluid velocity discretization.

Nagi Elabbasi
Veryst Engineering
In Mixture Model, Laminar Flow the discretization of phid (volume fraction of the dispersed phase) is I believe the same as the fluid velocity discretization. Nagi Elabbasi Veryst Engineering
J
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 13.11.2012, 19:10 GMT-5
Hi Nagi,

thanks for your reply. But I think that the discretization is linear (pressure and phid have the same amount of DoF). I just wonder why it is linear and why it is not possible to change it.

J
Hi Nagi, thanks for your reply. But I think that the discretization is linear (pressure and phid have the same amount of DoF). I just wonder why it is linear and why it is not possible to change it. J
Nagi Elabbasi Facebook Reality Labs
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 14.11.2012, 14:54 GMT-5
Thanks J for pointing this out. Yes phid follows the discretization order of the pressure not the velocity. That selection results in a more diffusive yet more stable scheme. It would be nice to have the option in COMSOL to select an independent discretization order for phid. You can still do that now if you manually (and properly) couple two separate physics fields; single-phase laminar flow and transport of species.

Nagi Elabbasi
Veryst Engineering
Thanks J for pointing this out. Yes phid follows the discretization order of the pressure not the velocity. That selection results in a more diffusive yet more stable scheme. It would be nice to have the option in COMSOL to select an independent discretization order for phid. You can still do that now if you manually (and properly) couple two separate physics fields; single-phase laminar flow and transport of species. Nagi Elabbasi Veryst Engineering

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content