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assign pressure initial condition on a flexible porous wall

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Old   March 28, 2012, 23:11
Default assign pressure initial condition on a flexible porous wall
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Shashwat
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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
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Old   March 29, 2012, 05:49
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Glenn Horrocks
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What mass flow do you have at the outlet?
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Old   March 30, 2012, 00:04
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Quote:
Originally Posted by ghorrocks View Post
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
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Old   March 30, 2012, 04:59
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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.
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Old   March 31, 2012, 10:14
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Quote:
Originally Posted by ghorrocks View Post
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.
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Old   March 31, 2012, 16:16
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In that case this is likely to be a FSI simulation.

Are you having any problems in running this? What is your question?
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Old   April 1, 2012, 08:23
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Quote:
Originally Posted by ghorrocks View Post
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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