Solving convection-diffusion problems in spherical coordinates

orangeDuck · March 24, 2023, 05:18

Hello to all,

I would like to solve a convection-diffusion scalar transport equation on the surface of a sphere (2D problem). The problem should have symmetry with respect to the main meridian.

Are OpenFOAM fvm and fvc operators able to work with spherical coordinates? If so, how can this be achieved?

überschwupper · March 28, 2023, 10:52

I dont think so. Since the operators are different in spherical coordinates it is (I dont know for sure, I just assume that by my knowledge) the implementation has to be different. But you can try to transform your equations into cartesian coordiantes and try it that way. Depending on your time its probably worth it.

serles · March 30, 2023, 05:29

You may also be interested in Finite Area Method for this task, e.g. available in foam-extend.

March 24, 2023, 05:18	Solving convection-diffusion problems in spherical coordinates	#1
orangeDuck New Member Join Date: Jan 2023 Posts: 10 Rep Power: 3	Hello to all, I would like to solve a convection-diffusion scalar transport equation on the surface of a sphere (2D problem). The problem should have symmetry with respect to the main meridian. Are OpenFOAM fvm and fvc operators able to work with spherical coordinates? If so, how can this be achieved?

March 28, 2023, 10:52		#2
überschwupper Member Join Date: Jan 2022 Location: Germany Posts: 72 Rep Power: 4	I dont think so. Since the operators are different in spherical coordinates it is (I dont know for sure, I just assume that by my knowledge) the implementation has to be different. But you can try to transform your equations into cartesian coordiantes and try it that way. Depending on your time its probably worth it. yueyun likes this.

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March 30, 2023, 05:29		#3
serles New Member Sergey Lesnik Join Date: Mar 2015 Posts: 14 Rep Power: 11	You may also be interested in Finite Area Method for this task, e.g. available in foam-extend.