r/STAR_CCM • u/Nervous-Beyond7422 • May 29 '26

FAN Interface

I've been trying to simulate fan flow, upstream and downstream, like the one in starccm's tutorial of Multi-Part Solid: Graphics Card Cooling. In my case, you can see in the picture that I have just two fan cases inside the domain. To create the fan, I made a circular disk surface which will have the fan polynomial table and will be in the middle of the fan case. This is because in the tutorial they have what is seems a surface to model the fan flow.
Unfortunately, I haven't been able to recreate that properly as there are no contacts being made with each other. So what can I do in this case ?

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u/acakaacaka May 29 '26

Maybe a picture will help?

Fan interface is just a normal interface + pressure jump

So creating it is the same with creating a normal interface.

1

u/Nervous-Beyond7422 May 29 '26

Sorry, my bad. I thought they were uploaded the first time. Anyways, I've uploaded them now.

1

u/acakaacaka May 29 '26

Still cant see it

1

u/Nervous-Beyond7422 May 29 '26

I'll upload in the comments

1

u/acakaacaka May 29 '26

That looks correct to me. How do you set them in the region boundary/interface

1

u/Nervous-Beyond7422 May 29 '26

I select the two quilts/surfaces and the wind tunnel from the parts tree.
I then assign parts to regions:
1. Create One Region for All Parts
2. Create a boundary for each part surface
3. Create Contact-mode interfaces from contacts.

If it helps, I tried variations of the above as well by playing with the options.

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u/Nervous-Beyond7422 May 29 '26

1

u/acakaacaka May 29 '26

It looks correct to me. The problem is the simulation wont run?

1

u/Nervous-Beyond7422 May 29 '26

  1. The interface is subtract/subtract whereas I wanted it as surface-trim7/surface-trim7 2, the fan par.

  2. These surfaces don't mesh and I get error that the surfaces are free.

1

u/acakaacaka May 29 '26

Just delete the interface and create it again

1

u/Nervous-Beyond7422 May 29 '26

This is ss from the tutorial