simulation of coronaries bypass

amirreza.kachabi · September 24, 2017, 10:56

hi. I want to simulate coronaries bypass. My geometry contains right coronaries & left coronaries and aorta. for boundary conditions, I have inlet & outlet flow of aorta, and as we know the pressure in all coronaries is the same as the aorta. can I set for my all outlets pressure outlet which is aorta pressure? I have read in some papers, they've used outflow conditions for outlet boundaries which they calculate flow rate weighting by Murray's law.does anybody know about Murray's law here? or how we can calculate flow rate weighting for each artery? for some arteries, I have outlet flow. how can I use outlet flow in fluent? should I just negative the flow for the outlet?

LuckyTran · September 26, 2017, 19:06

Be careful because it is very easy to measure everything experimentally and have too much information as input for CFD.

If you know your outlet flow, chances are you should be using a pressure outlet with targeted mass flow rate.

If you know the flow weights, use the flow-split BC.

If you want to specify the outlet pressures do so, but here you will not be able to control the flow-rate through each.

September 24, 2017, 10:56	simulation of coronaries bypass	#1
amirreza.kachabi New Member amirreza Join Date: Sep 2017 Posts: 4 Rep Power: 9	hi. I want to simulate coronaries bypass. My geometry contains right coronaries & left coronaries and aorta. for boundary conditions, I have inlet & outlet flow of aorta, and as we know the pressure in all coronaries is the same as the aorta. can I set for my all outlets pressure outlet which is aorta pressure? I have read in some papers, they've used outflow conditions for outlet boundaries which they calculate flow rate weighting by Murray's law.does anybody know about Murray's law here? or how we can calculate flow rate weighting for each artery? for some arteries, I have outlet flow. how can I use outlet flow in fluent? should I just negative the flow for the outlet?

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September 26, 2017, 19:06		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	Be careful because it is very easy to measure everything experimentally and have too much information as input for CFD. If you know your outlet flow, chances are you should be using a pressure outlet with targeted mass flow rate. If you know the flow weights, use the flow-split BC. If you want to specify the outlet pressures do so, but here you will not be able to control the flow-rate through each.