mesh independence
 

Hello
I have a particle in a tube
And i want to cheak mesh independency
What should i do?

you should create new mesh 50 percent finer. run the solution. and compare the answer with previous result. if there is no change , you approach the mesh independency.

I cheak my solution
That was correct
But when i change mesh
My results is different from each other

how many new mesh you create?

About 20 new mesh

first. your mesh must be good enough for your domain physic
second. each meshes must be finer to the previous one, about 50 %

Remesh. Rerun. Compare the results. That's the general idea. In general, the solution will change, because there is mesh dependency in the discretization. The question is how significant is the change in the result?

Look up Patrick Roache's grid convergence index for a cute method to quantify mesh dependence.

You can also run a coarser mesh.

Consider a tee pipe which has two inlet and one outlet let us have in one inlet pipe 5 lpm and in one inlet 7 lpm the output must be unique as 12 lpm by conservation of mass considering no internal effects. For studying mess independence we must have unique solution. Meshing and analysis of this pipe at outlet must always produce 12 lpm whatever mesh we provide we want the unique solution for studying mesh independence

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Refine your mesh and retry

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What are the Parameters that should kept constant?such as courent number or timestep

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