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Infinite Elements Fluid Dynamics

Posted 15 déc. 2011, 17:55 UTC−5 Fluid & Heat, Computational Fluid Dynamics (CFD), Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 4 Replies

Danielle Lower
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I want to model flow around a pipe. Instead of meshing a large block of air, is there a way to represent on of the air boundaries as infinite?
4 Replies Last Post 27 déc. 2011, 05:06 UTC−5
Chiwei Ong
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Posted: 1 decade ago 16 déc. 2011, 00:38 UTC−5
i am not sure whether you can impose open boundary or not. you may check the document.
i am not sure whether you can impose open boundary or not. you may check the document.
Akmal
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Posted: 1 decade ago 23 déc. 2011, 05:02 UTC−5
hi,

yes, using convective cooling. h for free convection about 5-25 W/m²K. Or there is also a formula how to evaluate h for horizontal cylinder on free convection.

h ~ Fluid.temperatur-outer cylinder.temperatur and Diameter

regards
akmal
hi, yes, using convective cooling. h for free convection about 5-25 W/m²K. Or there is also a formula how to evaluate h for horizontal cylinder on free convection. h ~ Fluid.temperatur-outer cylinder.temperatur and Diameter regards akmal
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 24 déc. 2011, 13:30 UTC−5
Infinite elements are not suitable for this type of CFD analysis. If you want to model the air flow around the pipe you need to model and mesh a suitably sized block of air. If your interest is only the heat loss resulting from the air flow you can avoid modeling the air and setup instead a convective boundary condition on the external pipe surfaces as Akmal suggested.

Nagi Elabbasi
Veryst Engineering
Infinite elements are not suitable for this type of CFD analysis. If you want to model the air flow around the pipe you need to model and mesh a suitably sized block of air. If your interest is only the heat loss resulting from the air flow you can avoid modeling the air and setup instead a convective boundary condition on the external pipe surfaces as Akmal suggested. Nagi Elabbasi Veryst Engineering
Akmal
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Posted: 1 decade ago 27 déc. 2011, 05:06 UTC−5
Hi All,

i'm not CFD expert (never use special CFD simulation software). But as far as i know, comsol is enough to do CFD simulation. There are modules to simulate fluid flow. To simulate air flow around a pipe it can be easely done.

there is some example, google thermos_laminar_flow.mph.

Comsol mesh can also be adapted for fluid or non-fluid.

happy holiday
akmal

Hi All, i'm not CFD expert (never use special CFD simulation software). But as far as i know, comsol is enough to do CFD simulation. There are modules to simulate fluid flow. To simulate air flow around a pipe it can be easely done. there is some example, google thermos_laminar_flow.mph. Comsol mesh can also be adapted for fluid or non-fluid. happy holiday akmal

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