Is this the correct visualization of the fan Boundary condition?

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  • Last Post 06 March 2019
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Kepojeyathas94 posted this 04 March 2019

Hi everyone.
I did a 3D interior volume and I've changed the BC type from interior to fan. But when I highlight the Fan I'm seeing this visualization. Is this the correct visualization of the fan? Because after the simulation it seems that the fan doesn't work. Should have I have to do something else to let work the fan?

This is the visualization on Fluent BC

The blue one is the 3d fan volume;

This is a zoom of the upper picture

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abenhadj posted this 04 March 2019

Add screenshot of when you highlight the interior before changing it to fan.

Best regards,

Amine

Kepojeyathas94 posted this 04 March 2019

It's the same visualization. Nothing changes from interior to fan BC type on the visualization

abenhadj posted this 04 March 2019

Is it intended to be a volume or surface? Check that additionally in your pre-processor

Best regards,

Amine

Kepojeyathas94 posted this 04 March 2019

It's intended to be a volume. In geometry and mesh is a 3d volume but in fluent I'm seeing the picture that I've sent. I don't know, maybe it's a mesh weakness because I did a poor mesh for fast calculation at the moment.

abenhadj posted this 04 March 2019

Give it a dedicated name the 3D volume so that you can adjust it under Cell Zones (not under Boundary Conditions)

Best regards,

Amine

Kepojeyathas94 posted this 04 March 2019

I've already made a 3d Named selection and I have the fan in Cell zones (as fluid). But I need to put it as fan in the boundary condition because I can't set a fan setting in the cell zone. Am I right?

kkanade posted this 05 March 2019

please give NS to a face which you want to use for fan boundary condition. 

Kepojeyathas94 posted this 05 March 2019

So Named selection for the face? Not to the 3D volume?

abenhadj posted this 05 March 2019

There are two kinds of fan boundary conditions: A 2D fan boundary and 3D fan zone condition.

Best regards,

Amine

Kepojeyathas94 posted this 05 March 2019

So with a 3D fan zone I can simulate a fan directly in the cell conditions, am I right? At the moment I changed the interior BC of the fan into 'fan' BC type but I'm having a poor flow.

 

This is a streamline starting from the fan BC I've set.

abenhadj posted this 05 March 2019

So you are using the 2D fan? What do you mean with poor flow?

Best regards,

Amine

Kepojeyathas94 posted this 05 March 2019

Yes, at the moment is a 2D fan. I did a 3D volume and named it in meshing. In fluent, in the boundary conditions I've got an interior surface of the fan so I've changed it to a fan BC type. The settings are the same as in the last picture. I would like to simulate an air flow from the fan to the red indicator (in the last post picture), but in the streamline the flow is very little that is why I said 'poor'

kkanade posted this 06 March 2019

the difference in min and max velocities is small.

Kepojeyathas94 posted this 06 March 2019

I'll try to increase the difference between min and max. Thanks a lot.

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