How to set pulsating inlet boundary conditions with a very high frequency
Hi,
I have a problem about how to set boundary conditions with a very high frequency. I want to simulate a transient flow in a pipe. The inlet of pipe is mass flow rate (amplitude of sinusoidal flow) of 0.2 kg/s with frequecy 60Hz. The outlet of pipe is total pressure . If the inlet of pipe is set mass flow rate, ANSYS CFX-Solver enforces inflow by erecting artificial walls on those faces where the flow attempts to exit the domain. The flow direction @inlet or outlet should change with time. So i set the inlet as velocity and outlet as openning. Is it OK? |
Ton,
You can turn off the artificial wall using Expert Parameters: Discretisation: Miscellaneous: build artificial wall: f. I've never tried it with a sinusoidal mass flow rate at my inlet, I've only done a sinusoidal total pressure at my inlet. Tristan |
Hi Tristan,
Thanks for your details reply! Ton |
Hey Ton,
I am also trying to do a transient simulation with sinusoidal inlet flow. But i haven't got any idea on how i can change the boundary conditions to incorporate the sinusoidal inlet flow. |
This is easy to do with a CEL expression.
|
Hey ghorrocks,
Are there any tutorials on how to create the CEL expression for sinusoidal inlet mass flow rate ? Thanks for your reply ! |
No, but it the CEL expession language is quite straight forward and once you have seen how the tutorials do it you will work it out. Have a look at the CFX tutorials.
|
Hey ghorrocks,
Thanks for your reply ! I am still having difficulty on understanding how i can incorporate CEL expression for Sinusoidal Inlet Flow Boundary Conditions ? Thanks |
Quote:
http://www.cfd-online.com/Forums/cfx...ne-funtin.html |
i need help plzzzzz
Dear all,
I am using Ansys to simulate how sinusoidal pressure at the inlet of a tube propagates and arrives to the output. I am going to record the pressure at both inlet and outlet on the same time. Please can anyone tell me how i can do that. many thanks amoon Quote:
|
Again, this is a routine CEL expression. Lance's link gives some further details. Do the tutorials and they demonstrate using CEL expressions.
|
All times are GMT -4. The time now is 13:30. |