[jimmy871013]

Dear friends:

Hello~~

I have a questions about UDF. I made a community blocks model to simulate street thermal environment and wind environment both. I simulated thermal environment in energy-plus and got wall temperature result.

Attachment 61928
this is the energy-plus simulation result image

In energy-plus, the calculate mesh is very big. But in CFD , I will use unstructured mesh to calculate, the mesh cells size is smaller then the energy-plus mesh cells. So the problem is : how to mapping the temperature result (I can get temperature result and temperature mesh location ) to the CFD mesh cells(I think i only need mapping surface temperature ,not volume temperature)?

I already check the Forums threads about this question, some experts said it should be solved by UDF( DEFINE_ADJUST function to set C_T_G).

Firstly, I am not sure this answer is right or not, so is that possible some one can share his idea about this question? THX~

Secondly, I am a beginner about UDF,is that possible some one can give me some examples about this question ? THX~

Thirdly,I understand everyone is busy, so is that possible some one can give me some advises or learning materials? THX~

Lastly, if some one can share his UDF about this question, I will share the energy-plus file to him if he need it. THX!!!!!

PS: If some one have any idea about this question pls send message to me~~~

Hope every one have nice days~~~

Kind Regards

Jimmy

[jimmy871013]

Attachment 61932

I do not know why I cannot see the energy-plus simulation result,so I upload again~~~

Thanks for anyone reply my thread~~

Jimmy

[AlexanderZ]

Using google you may find ANSYS Fluent Customization Manual
that document will help you with UDF.

From my point of view you need DEFINE_INIT macros if you need just to start your simulation with temperature from previous simulation.

C_T(c,t) is a macros to get temperature value at the cell
F_T(f,t) is a macros to get temperature value at the face (surface)

Best regards

[obscureed]

Hi Jimmy,

If you have temperature data on surfaces, and you would like to apply these as boundary conditions to a Fluent model, then that sounds like a job for a profile. This is a fairly straightforward feature -- see the User Guide chapter on Cell Zone and Boundary Conditions. If that is suitable, you will find it easier than User Defined Functions.

Good luck!
Ed

[jimmy871013]

Dear AlexanderZ:

Thanks for your reply. I already search the Customization Manual about DEFINE_INIT, I found there is an example but seems not suitable for me. Do you have any specific example ? Or maybe I should do more research then ask you. THX~~

[jimmy871013]

Dear obscureed:

Thanks for your reply. I think I can get every cells' location and temperature(the cells is on the thermal environment simulation mesh, it is not CFD mesh), and I want every CFD mesh cell get the temperature of thermal mesh's cell depends on the distance(when CFD cell close to the thermal cell,then CFD cell get thermal cell's temperature) . I will try your way to solve the problem but I think firstly I need read User guide. THX~~~