[siamak1438]

Hi,
The oscillatory shear index (OSI) is an important factor in hemodynamic use to measure disturbed flow along the artery wall. As you can see form the following formula (attached picture) it must be calculate after one cycle. In this formula T is the period of the one cycle. In the other hand, during one cycle, the shear stress on the artery wall must be integrated. So, I think to doing this calculation, I have to write UDF or even I have to develop code in Matlab or C++. I am wondering, is there anyone do it before? Can you guide me how can I do it?
Untitled.jpg
Yours,
Siamak

[ftab]

Hi Siamak,
I have done it exporting the WSS data of each time step to a file with a UDF.
Then, I actually calculate everything in Matlab simply with Trapezoidal integration, and then having the connectivity of the nodes and information of the faces I plot it in Tecplot.
The matlab code is very simple, the only concern is to export the XYZ of nodes and the connectivity of them to make triangular faces to a file to use it later to construct the plot in Tecplot.

Cheers,
Ftab

[emily.imdieke]

Hello,
Do you have to use integration though? Can't you just use the WSS components at each point?

[ftab]

Originally Posted by emily.imdieke

Hello,
Do you have to use integration though? Can't you just use the WSS components at each point?

By the definition, OSI is the integration over the cardiac Cycle!