# need clarification

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 August 14, 2012, 04:03 need clarification #1 Senior Member   Shashwat Join Date: Nov 2011 Posts: 107 Rep Power: 8 Dear friend I am doing simple flow analysis . This is transient analysis. Input is a variable pressure ( average pressure is 12000 pa -all the time) outlet pressure should be 0 Pa. with this condition I would like to increase the flow rate .I don't know the initial condition. I did as follows 1.steady state analysis I set the average pressure at the inlet and average velocity at the outlet .I varied the out let velocity when i need more flow.I did n't change the inlet pressure all the time. 2. Transient analysis end of steady state configuration I did the transient analysis now I use transient pressure at the inlet and I put 0 Pa at the outlet. I want to know is this correct way of setting different flow rate when the pressure doesn't change at the inlet and outlet all the time. Thank you for your kind consideration and your advice. Regards Shashwat

 August 14, 2012, 07:58 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,194 Rep Power: 109 I do not understand your question. Did you do a steady state simulation as an initial condition for a transient simulation? What are you trying to model with the transient simulation? What is the problem you are seeing?

August 14, 2012, 08:20
flow analysis in a stenosed artery
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Shashwat
Join Date: Nov 2011
Posts: 107
Rep Power: 8
Quote:
 Originally Posted by ghorrocks I do not understand your question. Did you do a steady state simulation as an initial condition for a transient simulation? What are you trying to model with the transient simulation? What is the problem you are seeing?
Yes I did steady state analysis simulation as an initial condition for a transient simulation.
My question is
I would like to do simulation for different flow rate keeping transient inlet pressure and outlet pressure constant

For example :

my flow rates are 50ml/min, 60ml/min, 100 ml/min etc
But I have to maintain the inlet pressure ( transient) and outlet pressure 0 Pa constant all the time for the above flow rates.

Thank you

Regards

Shashwat

 August 14, 2012, 08:34 #4 New Member   Join Date: Jul 2012 Location: Germany Posts: 23 Rep Power: 7 if you set the pressuredrop (inlet-outlet) in your fluid-domain you get a massflow as a result if you set the massflow and outlet pressure(e.g. 0 Pa relative) you got the inlet pressure as a result how can you vary the massflow in your geometry without affecting the pressuredrop? (1st law of thermodynamics or in simple cases without any work(vent...) or heat flux bernoulli equation)

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