assign pressure initial condition on a flexible porous wall

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 March 28, 2012, 23:11 assign pressure initial condition on a flexible porous wall #1 Senior Member   Shashwat Join Date: Nov 2011 Posts: 107 Rep Power: 7 Dear friends I am doing Transient analysis.The flow is in the z direction in a flexible porous pipe. model inlet condition : pressure(t), outlet: Mass flow rate I have data as shown below t=0s, p= 130mmHg t=0.1s , P= 135mmHg and so on. No other data I have. I need to set Global initial conditions on fluid domain and porous domain. I set the initial conditions in the fluid domain as shown below : static pressure> Option>Automatic value with value>Relative pressure = 130 mm Hg Is it correct? I set velocity U=0m/s, V=0m/s , W= 0.4m/s (for example) similarly I need to set initial conditions in the porous domain. Kindly help me to set the initial conditions. I set U=0 m/s , V=0m/s , W=0 m/s static pressure> Option>Automatic value with value>Relative pressure = ? Is the pressure is same as 130 mm Hg or 0 ? Kindly help me to proceed my simulations Thank you Regards Govind

 March 29, 2012, 05:49 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 What mass flow do you have at the outlet?

March 30, 2012, 00:04
#3
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Shashwat
Join Date: Nov 2011
Posts: 107
Rep Power: 7
Quote:
 Originally Posted by ghorrocks What mass flow do you have at the outlet?
Mass flow rate = 2.08x10^-3 kg/s
My outlet dia= 2.5mm
I am expecting flow 1.96ml/s at the outlet

Thank you

Regards

Govind

 March 30, 2012, 04:59 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 So you have a constant flow rate leaving the domain with a variable pressure being applied? This sounds unusual. Is the fluid compressible or incompressible? I have no idea what you are modelling so cannot comment on whether it is sensible or not - but so far it sounds strange.

March 31, 2012, 10:14
#5
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Shashwat
Join Date: Nov 2011
Posts: 107
Rep Power: 7
Quote:
 Originally Posted by ghorrocks So you have a constant flow rate leaving the domain with a variable pressure being applied? This sounds unusual. Is the fluid compressible or incompressible? I have no idea what you are modelling so cannot comment on whether it is sensible or not - but so far it sounds strange.

it is incompressible flow in a artery . it is an average flow in one cardiac cycle.

 March 31, 2012, 16:16 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 In that case this is likely to be a FSI simulation. Are you having any problems in running this? What is your question?

April 1, 2012, 08:23
#7
Senior Member

Shashwat
Join Date: Nov 2011
Posts: 107
Rep Power: 7
Quote:
 Originally Posted by ghorrocks In that case this is likely to be a FSI simulation. Are you having any problems in running this? What is your question?

My question is

1. I consider arterial wall as porous domain. What is the initial condition in the wall domain?

Thank you

Regards

Govind

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