Learning Forum

[ss_stardust]

Hi,

I am trying to input the interstitial heat transfer coefficient required by LTNE model in fluent via UDF. The UDF requires the fluid properties of the porous zone to calculate the Reynolds number and Prandtl number. These require fluid properties like cell velocity magnitude, density, specific heat, etc of the fluid present in porous zone.

So, I want to ask

1. which macros to use to call fluid cell values in UDF using macros, not the solid properties as there will be solid cells at the same spatial location as well created for LTNE model ?
2. what macro to use to get the magnitude of only u component of velocity?

Thanks in advance

[Karthik Remella]

Hello Your first question will require macros that are not documented in our User Guide. Because of this, unfortunately, we will not be able to answer this question on the forum. Having said that, you should be able to use Fluent Expressions to define the heat transfer coefficient between your solid and fluid porous region. It looks like you are talking about using an analytical expression.
Karthik

[ss_stardust]

Thanks for the reply.
Yes, the heat transfer coefficient that I want to add depends on these factors which themselves depend on temperature of the fluid cells. If not on the forum, if I use licensed technical support, can I expect the solution?
Also, I am looking for the tutorial (please see the attached figure) which is an old tutorial for LTNE along with the UDF used. It isn't available on net anywhere. So, if you could provide it, it would be of great help.

[Karthik Remella]

Hello I looked around for this old tutorial (Ansys 13.0) and, unfortunately, it cannot be found anywhere in our resources. My guess is that it has been retired.
Regarding the other question, if you do have access to licensed technical support, please check with them if they can share this information with you.
Thank you.
Karthik