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: 9	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).

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Divergence detected in AMG solver. VOF.	Mr.Mister	Fluent Multiphase	4	September 25, 2023 07:10
Error SIGSEGV using VOF and UDF	JERC_UTFSM	Fluent UDF and Scheme Programming	14	November 7, 2021 23:17
Fail to converge when solving with a fabricated solution	zizhou	FLUENT	0	March 22, 2021 06:33
[ANSYS Meshing] Help with element size	sandri_92	ANSYS Meshing & Geometry	14	November 14, 2018 07:54
fluent divergence for no reason	sufjanst	FLUENT	2	March 23, 2016 16:08

June 19, 2022, 22:25		#2
saiguruprasad Member Sai Guruprasad Jakkala Join Date: Jan 2017 Posts: 34 Rep Power: 9	Hey, Can anyone help me with this? I need to take the divergence of Reynolds Stress for my model. Thanks