[TharunSK]

Hello everyone.. I am trying to import convection coefficient from CFX onto certain faces of my model in ANSYS thermal. I have defined these (16) faces as named selection ('workingfaces') in CFX and also in ANSYS thermal.

Sharing a quick overview of my procedure-
From CFX post, I export air. HTC and air. temperature along with the node number and cordinates into a CSV file for 'workingfaces'. Now I access this CSV using external data component in ANSYS workbench and connect it to Setup in ANSYS transient thermal component. By right clicking imported load in ANSYS thermal, I add imported convection and assign the CSV data (heat transfer coeffcient and temperature) onto the 'workingfaces'.
This is my workflow.

The problem I am facing right now:
The HTC contour in CFD-Post and imported convection contour in ANSYS thermal are completely different. I have used almost similar mesh size for CFD and thermal models. The data in imported load summary-

Maximum source mesh bounding box length: 1.41658 (m)
Maximum range used in sorting closest nodes: 0.906614 (m)

Number of source nodes: 4559
Number of target nodes: 10624

Number of nodes mapped : 10624
Number of nodes not mapped : 0
Number of nodes outside : 4520

Percent nodes mapped: 100%
Weight calculation time: 0.5 (s)
Number of variables to interpolate: 2.
Interpolation time: 1.e-003 (s)

I have been trying to solve this for a couple of days and I cannot proceed further. I would appreciate your help.

Thanks.

[chose84]

Hi TharunSK,

I have same issue with different values of imported HTC from Fluent to Thermal...Did you manage to solve the issue? Someone else? Thanks.

[TharunSK]

Hi chose84,

My issue was with the positioning of the geometry in cordinate system in CFX and Thermal. Apparently, the geometry in CFX had the base in XY plane and in Thermal, it was in YZ plane. You can correct this misplacement in the External data component where you import the CFX data.
Hope this helps.

[chose84]

Hi TharunSK,
thank you for your quick response. I have solved out this issue. The issue was that I used direct connection of fluent with thermal task. In this way the HTC is loaded primarly as "wall function" and gives incorrect values. I wanted "surface HTC" and this is possible only by using the "external data" component in workflow. Now it works!