[klausb]

Hello,

I want optimize hydrofoils using a "watertunnel" domain.

The domain has a symmetry mirror plane so only one wing gets calculated.

The case setup is based on the motorBike case. The turbulence model is kOmegaSST, suitable for lowRe (the hydrofoils operate in a Re range between 300.000 and 2.000.000).

Running simpleFoam leads to the following error:

...
[2] --> FOAM FATAL ERROR:
[2] Invalid wall function specification
Patch type for patch minX_inlet must be wall
Current patch type is patch

...

Find attached the log file.

Is the domain inlet really a patch of type wall?

Find attached the related files (boundary...).

Klaus

[dasith0001]

Hi,

Just wondering if anyone has figured out to fixed the bug on '' how to set nutwallfunction when blockmesh had already define an inlet as a patch

In my case I need to set an inlet velocity to domain so setting the inlet patch to wall is not an option.

I am using OF7, any help is much appreciated.

Thanks

[Yann]

Hello,

You are not supposed to use a wall function on a inlet since wall functions are meant to be used on... walls.
On the inlet, nut should be set at calculated.

Regards,
Yann

[dasith0001]

Originally Posted by Yann

Hello,

You are not supposed to use a wall function on a inlet since wall functions are meant to be used on... walls.
On the inlet, nut should be set at calculated.

Regards,
Yann

Hi Yann,

Thank you for the reply. I am aware of that, and I was trying to assign 'calculated' BC to Inlet and Outlet (minX ans maxX in my case set-up) defined as patch in blockMesh.

But I am getting an error of ''Attempt to cast type calculated to type nutWallFunction at index 0'' when I am trying to do so.

I am trying this simplest chtMultiRegionFoam case with kOmegaSST turbulent model. OF version is v2012 and the case is running on windows with Ubuntu 20.04.

Perhaps something wrong with 'omega' BC definitions, but I tried all the combinations I could think of. The only time I got my case running is when I set inlet and outlet to ''type wall'' in blockMesh.

For consideration, I am attaching my all the case files, It is very much appreciated if you could shred some light.

Thank you
Dasith

[Yann]

Originally Posted by dasith0001

Thank you for the reply. I am aware of that, and I was trying to assign 'calculated' BC to Inlet and Outlet (minX ans maxX in my case set-up) defined as patch in blockMesh.

But I am getting an error of ''Attempt to cast type calculated to type nutWallFunction at index 0'' when I am trying to do so.

Then this means there is another error somewhere and you have to find it.

I had a look at your files, and you get this error because you still have wall functions applied on minX and maxX on omega. Replace it with fixedValue or inletOutlet as you did on k and it should be fine.

Regards,
Yann

[dasith0001]

Hi Yann,

Its up and running now!!!

Thank you very much . If anyone else is interested, I just attached the running case files.

Cheers,
Dasith