Setting up inlet boundary condition for a pulsatile flow

hasa2018 · December 16, 2016, 15:12

I am carrying out a fluid structure interaction analysis as a result of a pulsatile flow through an artery using ANSYS CFX and Mechanical.

At present I am trying to set the inlet boundary condition using the equation for Womersley number. I have so far set the following expressions in ANSYS CFX setup:

Diameter = 0.033 [m]
Viscosity = 6.2e-6 [m^2/s]
pulsefrequency = 0.9 Hz

Womersley number = (diameter/2)*((viscosity/pulsefrequency)^(1/2))

So when I go to insert a boundary condition and select an inlet boundary condition, I am wondering how can I use this expression?

Under boundary conditions I set my flow regime as subsonic, the mesh motion as stationary however under mass and momentum I can only input conditions relating to velocities as far as I can see.

I am a relatively new user of ANSYS so any step by step instructions on how to overcome this issue would be very useful.

Thanks in advance.

kastarkas · December 20, 2016, 02:55

Right click the space at the inlet BC and you will find the expressions tab and select your expression

December 16, 2016, 15:12	Setting up inlet boundary condition for a pulsatile flow	#1
hasa2018 New Member Anon Anon Join Date: Dec 2016 Posts: 1 Rep Power: 0	I am carrying out a fluid structure interaction analysis as a result of a pulsatile flow through an artery using ANSYS CFX and Mechanical. At present I am trying to set the inlet boundary condition using the equation for Womersley number. I have so far set the following expressions in ANSYS CFX setup: Diameter = 0.033 [m] Viscosity = 6.2e-6 [m^2/s] pulsefrequency = 0.9 Hz Womersley number = (diameter/2)*((viscosity/pulsefrequency)^(1/2)) So when I go to insert a boundary condition and select an inlet boundary condition, I am wondering how can I use this expression? Under boundary conditions I set my flow regime as subsonic, the mesh motion as stationary however under mass and momentum I can only input conditions relating to velocities as far as I can see. I am a relatively new user of ANSYS so any step by step instructions on how to overcome this issue would be very useful. Thanks in advance.

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December 20, 2016, 02:55		#2
kastarkas Member kastarkas Join Date: Aug 2016 Posts: 45 Rep Power: 10	Right click the space at the inlet BC and you will find the expressions tab and select your expression