Related to Wall Shear Stress calculation

msd · January 19, 2022, 08:41

Hello!

I am working on a patient-specific geometry consisting of the aorta and coronary arteries. I want to break down the Wall Shear Stress into the tangential and the normal shear stress components. Is there a possible way to do that? I am interested in the tangential component in the direction of flow.

Thanks in advance!

agd · January 19, 2022, 09:10

Can you not simply use the surface normal and tangent vectors to resolve the components of the shear stress along those directions using the dot product?

msd · January 19, 2022, 09:18

While using CFD Post, I am getting a variable 'normal' but I am not sure how to obtain the tangential component? Should I obtain the tangential component through the normal component? I am not very clear about this, it would be great if you could elaborate on this?

Thank you in advance!

FMDenaro · January 19, 2022, 11:46

Quote:

Originally Posted by msd

While using CFD Post, I am getting a variable 'normal' but I am not sure how to obtain the tangential component? Should I obtain the tangential component through the normal component? I am not very clear about this, it would be great if you could elaborate on this?

Thank you in advance!

Be careful, in 3D you have the unique normal direction but not a unique tangential one. if you have a pipe-shape that should be clear.

msd · March 8, 2022, 10:18

Quote:

Originally Posted by FMDenaro

Be careful, in 3D you have the unique normal direction but not a unique tangential one. if you have a pipe-shape that should be clear.

Thank you for your help! I will check this out!

January 19, 2022, 08:41	Related to Wall Shear Stress calculation	#1
msd Member Heer Join Date: Oct 2020 Posts: 44 Rep Power: 5	Hello! I am working on a patient-specific geometry consisting of the aorta and coronary arteries. I want to break down the Wall Shear Stress into the tangential and the normal shear stress components. Is there a possible way to do that? I am interested in the tangential component in the direction of flow. Thanks in advance!

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January 19, 2022, 09:10		#2
agd Senior Member Join Date: Jul 2009 Posts: 351 Rep Power: 18	Can you not simply use the surface normal and tangent vectors to resolve the components of the shear stress along those directions using the dot product?

January 19, 2022, 09:18		#3
msd Member Heer Join Date: Oct 2020 Posts: 44 Rep Power: 5	While using CFD Post, I am getting a variable 'normal' but I am not sure how to obtain the tangential component? Should I obtain the tangential component through the normal component? I am not very clear about this, it would be great if you could elaborate on this? Thank you in advance!