Divergence of SymmTensor

saiguruprasad · May 3, 2022, 14:16

I am trying to write a new Particle Dispersion Model in OpenFOAM. The model requires the divergence of the Reynolds stress tensor. I am able to read the Reynolds stress tensor into the model and am able to perform the fvc::div operation.

My doubt is if this approach is correct. I tried fvc::div(U) in the same way and it gave really high values (O(1)) which are not correct because the simulation has converged and the fvc::div(U) should be a small value (O(1e-3)). So now I have doubts if fvc::div(R) is giving the right values.

I have the phi variable too which I think is U*surfaceArea. I computed div(phi, U) and div(phi), and both gave small values in O(1e-3).

Should I be using phi to compute the divergence of R? I am getting an error if I use fvc::div(phi,R).

saiguruprasad · June 19, 2022, 22:25

Hey,

Can anyone help me with this? I need to take the divergence of Reynolds Stress for my model.

Thanks

May 3, 2022, 14:16	Divergence of SymmTensor	#1
saiguruprasad Member Sai Guruprasad Jakkala Join Date: Jan 2017 Posts: 34 Rep Power: 8	I am trying to write a new Particle Dispersion Model in OpenFOAM. The model requires the divergence of the Reynolds stress tensor. I am able to read the Reynolds stress tensor into the model and am able to perform the fvc::div operation. My doubt is if this approach is correct. I tried fvc::div(U) in the same way and it gave really high values (O(1)) which are not correct because the simulation has converged and the fvc::div(U) should be a small value (O(1e-3)). So now I have doubts if fvc::div(R) is giving the right values. I have the phi variable too which I think is U*surfaceArea. I computed div(phi, U) and div(phi), and both gave small values in O(1e-3). Should I be using phi to compute the divergence of R? I am getting an error if I use fvc::div(phi,R).

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June 19, 2022, 22:25		#2
saiguruprasad Member Sai Guruprasad Jakkala Join Date: Jan 2017 Posts: 34 Rep Power: 8	Hey, Can anyone help me with this? I need to take the divergence of Reynolds Stress for my model. Thanks