Have you already successfully created the coupled interfaces？

Unfortunately I still cannot find the solution. Non-conformal interfaces work just fine with the porous equilibrium thermal model. It just doesn't work with the non-equilibrium model.

I'm still not very clear about your problem. But note that the thermal non-equilibrium model in Fluent would always create two grids: one is for fluid region (denoted by Rf) and the other is for porous skeleton region (denoted by Rs). Fluent automatically connects Rf  and the region next to porous media region (denoted by Rn), but the porous skeleton region is still not connected to Rn. According to my experience, if this is ignored, Fluent also gives error messages. To solve the related problems, I first create two interface boundary conditions in Gambit, then in Fluent the thermally coupled interfaces (which connects Rn and Rf+Rs) can be (and should be) created. Finally the non-equilibrium model functions well. Hope this  give you some help!

I have two cell zones that are sliding relative to each other (rotation). They are connected with a non-conformal interface. One of those interfaces is a porous zone .

I want to do a transient simulation of hot air blowing on an exchanger and observe the heating up of the solid (recuperator). Therefore a non-equilibrium heat transfer needs to be switched on.

Somewhat fluent doesn't allow me to switch the non-equilibrium heat model on when interfaces are present. Instead it throws the message:

"A duplicate of this zone cannot be generated automatically, as it contains a non-conformal mesh interface.

You must manually make a copy the porous fluid zone and define it as a solid zone before you enable the non-equilibrium thermal model."

So according to this message and fluent's help it is possible to use non-equlibrium heat model with non-conformal interface.

So I did as instructed and copied the zone manual with

mesh/modify-zones/copy-move-cell-zone

command.

I changed the zone type to solid and it's BC's to wall.

Still, a warning message comes up and doesn't allow me to switch the model on.

Maybe you should change the solid BC type to interface, so that the two cell zones can be correctly connected.

Thank you for your contribution Yao, I finally solved the problem. In Ansys Fluent 15 you have to delete all interfaces, select non-equlibrium model and apply interfaces again. It is crucial to not edit porous cell zone again as it will automatically turn-off non-equlibrium model. So every time you want to edit a porous cell zone (e.g. porosity parameters or mesh motion) you have to delete interfaces and apply them again after you finish editing.

dear Tytus, recently, I try to study the flow transport and heat transfer in porous media by non-equilibrium thermal model, but i have some trouble, could you give me some advises?

Yes, sure

Thanks a lot, I'm studying the flow transport and heat transfer in porous rock, whose porosity is very. I want to know how to define the heat transfer rate (h) between liquid and solid in porous media?

There are two types of porous heat transfer models : equilibrium and non-equilibrium model. Equilibrium model doesn't consider transient material heating up process. It assumes that the material is in thermal equilibrium. So for steady state simulation or when you just want to know the resultant thermal state the equilibrium model should be enough. If you want to know how the material is heating up you need to enable the non-equilibrium model which requires a coincident cell zone to be created (automatically) with solid material properties.

I got it, thanks a lot

Dear Tytus, I have an issue regarding the porous zone and I need your help. I have a cylinder which contains a porous zone and air ( the air is moving back and forth by a piston).

there is heat transfer between the porous zone and the air inside this cylinder. I am confused should I consider this case as "non-equilibrium model" or it is an "equilibrium model" ???

If you want to model transient heat transfer such a piston induced oscillating flow you should use a non-equlibrium model as the temperatures may vary across the surface in space and time.

thank you Tytus.

Hello Tytus Tulwin ,

Really appreciate your suggestion for considering non-thermal equilibrium model for transient heat transfer. I am a bit confused on how two different heat transfer equation (for solid phase and for air) works on a single node of an element when considered a non-equilibrium model to solve the problem?

Thanks