[danquahj]

Hello all,

For my university dissertation I am looking to use active flow control as a means of enhancing the performance of a diffuser equipped bluff body in ground effect. The effect I am trying to simulate is similar to the Blown Diffusers seen in Formula One cars of the 2011 era.

I have successfully completed CFD simulations of a baseline body.

My question concerns how to define the small face surface area on my body that will act as my exhaust exit, using boundary conditions? Is it a simple velocity inlet ?

How would i account for the temperature of the exhaust gases ?

Are there any other fluid properties i must account for to properly capture the behavior of exhaust flow.

Any advice would be greatly appreciated! Thank you.


https://drive.google.com/open?id=1y4...FM5uvpjzyQnJyA
https://drive.google.com/open?id=1rP...UMYQIWDU9cqX_A

[vinerm]

Yes, you can apply velocity inlet, as long as the material density is constant. If it is not so, then you have to apply either pressure inlet or mass flow inlet along with temperature. Assuming that the material properties are constant and, consequently, you are not solving for Energy equation, then you can apply velocity inlet. However, ensure that the properties, i.e., density and dynamic viscosity are as per the exhaust temperature. Whether something else is important or not depends on the physical models being used, such as, species transport or energy.

[danquahj]

Thank you very much for your help, I have now successfully implemented your suggestions in my simulation.

Thanks again,
Jesse