How to set pulsatile flow in cfx?

bmdaortiz · September 8, 2009, 16:19

hi everyone, im just begining with simulations in cfx and i want to simulate pulsatile blood flow to see wall shear stress in a stenotic vessel... i have done most of the tutorials included in cfx but i still dont know how to set my flow as pulsatile, if some one can help me that would be very useful,
Thank you in advance

ckleanth · September 8, 2009, 18:54

transient case and setup inlet boundary conditions as a function of time or timestep.

check the function that you can use to create an exression that is linked with the timestep for example atstep; start your simulation simply and only when you get meanginful results add complexity

bmdaortiz · September 8, 2009, 19:31

thank you for your answer i will try it... but its there a way to enter for example pressure as a function of time but in a table like a pressure load?

Thanks again for the help

ckleanth · September 8, 2009, 19:50

search in the cfx manual for "Problems with Convergence" and read that section

I sugest you also read the "Initialization Advice" and "Recommended Configurations of Boundary Conditions" sections..

bmdaortiz · September 8, 2009, 23:48

sorry if i dont understand correctly but what i want (i dont know if it is possible) is to enter as an inlet in a boundary condition a cloud of poits that i have

time Pressure
0 80
0,1 100

like that... i cant find the way to do it

regards,
Daniel

September 8, 2009, 16:19	How to set pulsatile flow in cfx?	#1
bmdaortiz New Member Daniel Join Date: Aug 2009 Posts: 3 Rep Power: 17	hi everyone, im just begining with simulations in cfx and i want to simulate pulsatile blood flow to see wall shear stress in a stenotic vessel... i have done most of the tutorials included in cfx but i still dont know how to set my flow as pulsatile, if some one can help me that would be very useful, Thank you in advance

September 8, 2009, 18:54		#2
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	transient case and setup inlet boundary conditions as a function of time or timestep. check the function that you can use to create an exression that is linked with the timestep for example atstep; start your simulation simply and only when you get meanginful results add complexity __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

September 8, 2009, 19:31	Thank you	#3
bmdaortiz New Member Daniel Join Date: Aug 2009 Posts: 3 Rep Power: 17	thank you for your answer i will try it... but its there a way to enter for example pressure as a function of time but in a table like a pressure load? Thanks again for the help

September 8, 2009, 19:50		#4
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	search in the cfx manual for "Problems with Convergence" and read that section I sugest you also read the "Initialization Advice" and "Recommended Configurations of Boundary Conditions" sections.. __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

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September 8, 2009, 23:48	hi	#5
bmdaortiz New Member Daniel Join Date: Aug 2009 Posts: 3 Rep Power: 17	sorry if i dont understand correctly but what i want (i dont know if it is possible) is to enter as an inlet in a boundary condition a cloud of poits that i have time Pressure 0 80 0,1 100 like that... i cant find the way to do it regards, Daniel