Giving fluid properies

ami1991 · April 8, 2013, 12:05

I am final year student doing a project in ansys cfx. I am modelling left coronary artery and studing the motion of blood in it. kindly help me on how to give the properties of blood in cfx...

ghorrocks · April 8, 2013, 18:28

Is your question how to model blood properties (ie you already know the properties you want to apply but do not know how to apply them) or do you have no idea what properties you should use to model blood (then the answer is to do a google search or a literature review and read about what other people have done).

ami1991 · April 9, 2013, 12:46

my question is what all properties are to be applied and how to apply them... kindly help me...

evcelica · April 9, 2013, 13:14

This is really, really basic. Have you even tried to do it yet? I'm sure you could figure it out in 2 seconds if you tried. In CFX pre, go to materials, right click, insert new material, and you can figure it out from there.

wethiq · April 10, 2013, 07:11

Hi, the blood is non-Newtianon fluid i.e., the viscousity is function of rate strain therefore in Fluent select define > material and select nontainon fluid and selct model such as power_law and input constant.

ghorrocks · April 10, 2013, 07:21

There are many different rheologies used to model blood. Ressan mentions one.

But significant contributions occur due to the particles in the blood. In particular, the red blood cells stretch and squeeze to get through the tin capilliaries. Blood also has visco-elastic properties. Whether these are important depends on what you are trying to model.

ami1991 · April 10, 2013, 12:48

Quote:

Originally Posted by evcelica

This is really, really basic. Have you even tried to do it yet? I'm sure you could figure it out in 2 seconds if you tried. In CFX pre, go to materials, right click, insert new material, and you can figure it out from there.

sir,
I have already tried working in ansys and i am still working. Its just that its a little confusing for first time user like me.

ami1991 · April 10, 2013, 12:49

Quote:

Originally Posted by ghorrocks

There are many different rheologies used to model blood. Ressan mentions one.

But significant contributions occur due to the particles in the blood. In particular, the red blood cells stretch and squeeze to get through the tin capilliaries. Blood also has visco-elastic properties. Whether these are important depends on what you are trying to model.

thankyou sir..

ami1991 · April 10, 2013, 12:50

Quote:

Originally Posted by wethiq

Hi, the blood is non-Newtianon fluid i.e., the viscousity is function of rate strain therefore in Fluent select define > material and select nontainon fluid and selct model such as power_law and input constant.

thank you sir

silvai · October 4, 2017, 08:25

Dear ami1991 and other CFD team!

I also have the same question than ami1991 some years ago.

I want to simulate blood flow in ANSYS using the PTT model. My question is: Is it possible to give the properties of blood (relatively to PTT model) in CFX?? I think that in Fluent is not possible...

Is is possible in CFX to introduce the properties and how?

Someone did it? And can help me?

Thank you very much!

ghorrocks · October 4, 2017, 20:46

CFX has a number of ways of specifying material properties. It also has a number of non-Newtonian models built in. But it does not have the PTT model - as I stated in my previous post it appears this is a 1D fluid model, so it is not suitable for CFX as CFX is a 3D solver. But if you can express the PTT model parameters in one of the existing CFX models then it will be easy to put into CFX. More sophisticated models can be done using CEL and/or user fortran.

I recommend you have a look at the material properties available in CFX and see what could be adapted to the model you wish to use.

April 8, 2013, 12:05	Giving fluid properies	#1
ami1991 New Member Join Date: Apr 2013 Posts: 6 Rep Power: 13	I am final year student doing a project in ansys cfx. I am modelling left coronary artery and studing the motion of blood in it. kindly help me on how to give the properties of blood in cfx...

April 10, 2013, 07:11	blood properties	#5
wethiq New Member ressan Join Date: Apr 2013 Posts: 4 Rep Power: 13	Hi, the blood is non-Newtianon fluid i.e., the viscousity is function of rate strain therefore in Fluent select define > material and select nontainon fluid and selct model such as power_law and input constant.

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April 8, 2013, 18:28		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Is your question how to model blood properties (ie you already know the properties you want to apply but do not know how to apply them) or do you have no idea what properties you should use to model blood (then the answer is to do a google search or a literature review and read about what other people have done).

April 9, 2013, 12:46		#3
ami1991 New Member Join Date: Apr 2013 Posts: 6 Rep Power: 13	my question is what all properties are to be applied and how to apply them... kindly help me...

April 9, 2013, 13:14		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	This is really, really basic. Have you even tried to do it yet? I'm sure you could figure it out in 2 seconds if you tried. In CFX pre, go to materials, right click, insert new material, and you can figure it out from there.

April 10, 2013, 07:21		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	There are many different rheologies used to model blood. Ressan mentions one. But significant contributions occur due to the particles in the blood. In particular, the red blood cells stretch and squeeze to get through the tin capilliaries. Blood also has visco-elastic properties. Whether these are important depends on what you are trying to model.

October 4, 2017, 08:25		#10
silvai New Member Join Date: May 2013 Posts: 21 Rep Power: 12	Dear ami1991 and other CFD team! I also have the same question than ami1991 some years ago. I want to simulate blood flow in ANSYS using the PTT model. My question is: Is it possible to give the properties of blood (relatively to PTT model) in CFX?? I think that in Fluent is not possible... Is is possible in CFX to introduce the properties and how? Someone did it? And can help me? Thank you very much!

October 4, 2017, 20:46		#11
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	CFX has a number of ways of specifying material properties. It also has a number of non-Newtonian models built in. But it does not have the PTT model - as I stated in my previous post it appears this is a 1D fluid model, so it is not suitable for CFX as CFX is a 3D solver. But if you can express the PTT model parameters in one of the existing CFX models then it will be easy to put into CFX. More sophisticated models can be done using CEL and/or user fortran. I recommend you have a look at the material properties available in CFX and see what could be adapted to the model you wish to use.