[dhruv]

Hi Foamers,

i am doing a simulation on channel flow using LES modelling. I want to impose a temperature on the walls of the channel and study the effects of conduction+convection on the fluid flowing through it. Can anyone give me some ideas on how to implement this? I can't impose a cyclic BC on temp, since it is not cyclic. Is there any other solver that I can use that gives me the local temperatures in the fluid field? My main intention of using a channel flow for this problem is that the geometry I need to simulate is a very long one, and I am using just a part of it with cyclic BCs.

Any help would be very grateful.

Regards,
Dhruv.

[kwardle]

Have you looked at this?http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam

[Davidlt]

Hi Drhuv

It depends on the fluid and the Re number of your simulation. If your case can be considerate as incompressible, you could check on how the buoyantBoussinesqPimpleFoam is coded. Because this solver is only for RANS cases, you'll need to modify it. Check the pimpleFoam solver for an idea.

David

[libia87]

Hi! I do all the tutorial to add the temperature, but it gives me a fatal error: keyword inlet is undefined in dictionari .../0/p::"boundaryField"

I don't understand this problem because I did't change anything about the pressure

[niaz]

Dear libia
you may define a BC in your mesh boundary but you do not implement it in your /0 folder for pressure.

[libia87]

Originally Posted by niaz

Dear libia
you may define a BC in your mesh boundary but you do not implement it in your /0 folder for pressure.

I don't understand...

[niaz]

Originally Posted by libia87

I don't understand...

firstly check that you have inlet in your 0/p file or not

[nimasam]

Originally Posted by dhruv

Hi Foamers,

i am doing a simulation on channel flow using LES modelling. I want to impose a temperature on the walls of the channel and study the effects of conduction+convection on the fluid flowing through it. Can anyone give me some ideas on how to implement this? I can't impose a cyclic BC on temp, since it is not cyclic. Is there any other solver that I can use that gives me the local temperatures in the fluid field? My main intention of using a channel flow for this problem is that the geometry I need to simulate is a very long one, and I am using just a part of it with cyclic BCs.

Any help would be very grateful.

Regards,
Dhruv.

i dont know any solver which can do what you want, as i know you should implement your cyclic boundary condition, and heat transfer solver
your modified solver:
1) modified solver:
channelFoam + scalarTransportFoam

2) BC:
modified fan boundary condition

i suggest to look at fluent tutorial guide to find how to formulate cyclic boundary condition

[libia87]

Originally Posted by niaz

firstly check that you have inlet in your 0/p file or not

yes I have it!

[Toorop]

I while back when I started my endeavours with OpenFoam I looked at some Fluent tutorial cases and wanted to migrate them to OF. It was too much for me eventually ... so I dropped the idea.

But there was a case with periodic flow and heat transfer - as I investigated the possible solutions I found that the solver is based on "Fully Developed Flow and Heat Transfer in Ducts Having Streamwise-Periodic Variations of Cross-Sectional Area" by Patankar, Liu, and Sparrow. And unfortunately, that concluded my project since I didn't find anything similar in OF - I didn't even know at that time that channelFoam exists and can simulate periodic flow.

Good luck and report back if you have some nice results!

[niaz]

Originally Posted by libia87

yes I have it!

I think it is better to attach your test case?
your description is a bit vague.