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Time Varying Velocity Input

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Old   January 12, 2022, 14:15
Default Time Varying Velocity Input
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Merlin Williams
Join Date: Nov 2021
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Hello,

I am a university student and am very new to OpenFOAM and am having trouble trying to implement a time varying Velocity input.

The goal of what I am trying to do is implement a transient time varying velocity input which will simulate the flow of blood in an artery for three heart beats for an FSI simulation.

For my blood flow I have values of the velocity at time steps of 0.005s and the shape of the waveform, but I do not have a polynomial to describe it.

I have been playing around with the input for the solids4foam tutorial of 'fixed and conformal cylinder in channel' trying to make it a time varying velocity input but it has not worked.

So far I have tried writing a uniformFixedValue boundary condtion but with a table input as shown below:


Inlet
{
type uniformFixedValue;
uniformValue table
(
(0 (0.2517 0 0))
(0.0050 (0.2603 0 0))
(0.0100 (0.2688 0 0))
(0.0150 (0.2774 0 0))

.
.
.
(0.7400 (0.2529 0 0))
(0.7450 (0.2523 0 0))
(0.7500 (0.2517 0 0))
)
}


But this has not worked. Please can somebody advise me if a uniformFixedValue BC is the correct one or how i should implement a time varying velocity when I have the values of the velocity in time. I have also seen some boundary conditions use a tabular format as an input but I am not sure how to make a file with my tabulated values or where in the case I should place it.

I realise this is a lot but I really have no idea what to do and I have had a look at the other threads and they have not really helped, I am desperate, please can somebody help.

Thank you in advance

Merlin




EDIT: I realise I might be trying to implement this BC on the wrong tutorial so if anybody has a case of their own or know of a tutorial on OpenFOAm, foam-extent 4.0 or solids4foam which I could test the BC out on then that would also be very helpful. Also a lot of threads talk about not having the right solver for a certain conditon, I do not know what solver I am using or will be using (but I will be using one which is FSI compatible on solids4foam) so would prefer to have a BC which is pretty compatible with any solver.
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blood flow, boundary condition, time varying boundary, transient

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