[Ozora]

I want to simulate air circulating in a room with fan. My confusion is I dont let air in room by fan but circulate the current air. So i dont know how to do boundary conditions. I searched a lot but if you have a tutorial or idea please share with me,

Thank you

* One more thing, i have 4 fans in the room.

[Bionico]

Hello Ozora,
I suggest reading Fan Boundary Condition in Fluent Manual: it models a fan (without blades) using a pressure jump.
In order to use this feature you should create a surface through which you create the pressure gradient.
Try it!

Regards

[Ozora]

I tried a simple geometry a cube and a circle ( thicknes 3cm ) middle of the cube . And i did fan boundary condition for one face, also in zone section i gave a radial velocity but when i check the results i saw that i only calculated the circle area not all geometry.

I hope i could explain my problem

[Bionico]

Sorry,
I can't undersand your problem: could you attach a picture, please?

Regards

[Bionico]

Sorry,
I can't undersand your problem: could you attach a picture, please?

Regards

[Ozora]

it's more complicated actually but simply i can show like this. My problem is "fan-propeller" which circulate the air. I found some info like " i need to use source terms, mass, momentum etc" but i cant imply it. Also i only know electricity motor that drive the propeller. So one more question, if i want to find mass flow of air which leave the fan, how can i do that ? If you have any tutorial or idea i would be glad.

Thank you,

[Bionico]

Hello Ozora,
to calculate Mass Flow you can select the surfaces of your propeller and go to Surface Integrals Menu.
The problem is how to model your fan: I don't know why fan boundary condition in the middle doesn't work...
Anyway I will try to simulate your problem when possible.

Regards

[Ozora]

I dont understand either

Thank you very much.