wrong Deformation result

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  • Last Post 03 June 2020
maryam posted this 01 June 2020

Hi everyone,

I simulated a LAD artery using FSI modeling (Fluid in Fluent and Solid in Transient Structural). I set velocity waveform as inlet boundary conditions and pressure wave form as outlet. When i check the result there is not any problem with Fluent part and the results make sense but about the deformation i can not say the same thing. The deformation increases linearly with the time not pressure or velocity (you can see the chart in attached file). Anybody knows where the problem may be?

 

Maryam

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bsista posted this 03 June 2020

FYI - You may want to share the images using the "Insert Image" option instead of uploading it as a file.

Regarding your question, it's hard to comment without knowing the details of the model. Perhaps, it may be easier to check how the deformation, the pressure, and the velocity independently vary w.r.t time and see if there's anything suspicious about these quantities.

Also, please note that the total deformation is reported at each node and the chart only plots the min., max., and the average deformation throughout the model. So if the min., or max. locations change during the course of time then the chart that you're seeing is reporting values at different locations.

A more reliable way for verifying the results is to identify one or more nodes from regions of interest and plot the total deformations at those locations separately to see how the deformation at those locations vary over the time. 

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maryam posted this 03 June 2020

Thank you for getting back to me.

Can you please tell me how i can check the exact total deformation at different nodes?

Tabular data only shows the max, min and average deformation but i need to know the exact total deformation at each time step.

 

Maryam

 

bsista posted this 03 June 2020

Create a new “Total Deformation” object and scope it to the node of interest (scoped to All Bodies by default), this will give you the magnitude of displacement. Alternatively, use “Directional Deformation” to get components in X, Y or Z directions.

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maryam posted this 03 June 2020

I did what you said but it gives me again max, min and average deformation w.r.t time at that node.

I specified velocity and pressure waveform at inlet and outlet respectively(attached images) and i think the deformation must be waveform but it is increasing linearly. I can not understand this part???

maryam posted this 03 June 2020

I could check the magnitude of displacement in the way you explained. Thanks

But do you think there is a way we could get the deformation waveform w.r.t time step throughout the model?

maryam posted this 03 June 2020

I found this picture in another post. what i mean is something like this.

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