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How to set pulsating inlet boundary conditions with a very high frequency |
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April 28, 2009, 04:00 |
How to set pulsating inlet boundary conditions with a very high frequency
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#1 |
New Member
Join Date: Apr 2009
Posts: 7
Rep Power: 17 |
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? |
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April 28, 2009, 13:50 |
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#2 |
Member
Tristan Burton
Join Date: Mar 2009
Posts: 43
Rep Power: 17 |
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 |
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May 3, 2009, 22:12 |
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#3 |
New Member
Join Date: Apr 2009
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Hi Tristan,
Thanks for your details reply! Ton |
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August 22, 2011, 15:13 |
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#4 |
New Member
Join Date: Aug 2011
Posts: 11
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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. |
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August 22, 2011, 22:39 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
This is easy to do with a CEL expression.
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August 23, 2011, 09:35 |
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#6 |
New Member
Join Date: Aug 2011
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Hey ghorrocks,
Are there any tutorials on how to create the CEL expression for sinusoidal inlet mass flow rate ? Thanks for your reply ! |
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August 23, 2011, 20:05 |
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#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
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.
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August 24, 2011, 11:12 |
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#8 |
New Member
Join Date: Aug 2011
Posts: 11
Rep Power: 15 |
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 |
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August 25, 2011, 02:55 |
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#9 | |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
Rep Power: 22 |
Quote:
http://www.cfd-online.com/Forums/cfx...ne-funtin.html |
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March 22, 2012, 11:44 |
i need help plzzzzz
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#10 | |
New Member
kamar
Join Date: Mar 2012
Posts: 3
Rep Power: 14 |
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:
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March 22, 2012, 17:57 |
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#11 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
Again, this is a routine CEL expression. Lance's link gives some further details. Do the tutorials and they demonstrate using CEL expressions.
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