Learning Forum

[changan627]

In the Fluid Behavior simulation, some of the out conditions are pressure, some are outflow Is that just random? Can users to choose it? And how? I do not see it in the tutorials  

[Brian Bueno]

ZhangMing

In most cases, the inlet velocity is a known quantity, and the velocity at the outlet is unknown.  For that scenario, you should specify inlet velocity, and use a pressure condition of 0 Pa at the outlet.  You can then measure the velocity at that location.

The user can alter the boundary conditions for any location, so it is possible to define an exit velocity for this type of problem.  You would need to delete any existing boundary condition on that location and replace it with a new one.

[changan627]

BBueno_ANSYS 

Thank you a lot.

And I have another question, can I set the boundary condition with mass flow rate or volumetric flow rate?

I do not see that option, but sometimes flow rate is what I want to control.

[Brian Bueno]

ZhangMing 

It is not currently possible to create a boundary condition using mass/volumetric flow rate.

[Naresh Patre]

ZhangMing Mass flow rate boundary condition is available in R19.1 version released yesterday. Please check out the release notes from this post

[changan627]

Naresh Patre I downloaded the R19.1 version for students, but I couldn't see the flow rate boundary condition.

Would you please show me a picture of where it is?

Thank you very much.

[Gaurav Sharma]

ZhangMing The Mass flow rate option can be accessed in version 19.1 from the setup as shown below: Alternatively, you can click on any face and the mass flow option can be selected from the drop down menu as shown below: