anyone like to explain previous time-step mesh compression flux?

Ash Kot · June 10, 2019, 12:09

In an interFoam.C file, under dynamic mesh code, after if (mesh.changing())
there is an cautionary comment saying:
'do not apply previous time-step mesh compression flux!'
So, why is that?
In what applications I need to apply previous time-step mesh compression flux?
is it related to compressible fluid, and in-compressible fluid CFD simulations? or
is it just a C++/coding related cautionary comment?

2538sukham · October 4, 2023, 12:26

Have you worked it out? Because I had the same problem regarding the compression flux. In foamExtend, it is not there. It is a bit hard to figure out without having a test case .

June 10, 2019, 12:09	anyone like to explain previous time-step mesh compression flux?	#1
Ash Kot Member Ash Kotwal Join Date: Jul 2016 Location: North Dakota, USA Posts: 92 Blog Entries: 1 Rep Power: 10	In an interFoam.C file, under dynamic mesh code, after if (mesh.changing()) there is an cautionary comment saying: 'do not apply previous time-step mesh compression flux!' So, why is that? In what applications I need to apply previous time-step mesh compression flux? is it related to compressible fluid, and in-compressible fluid CFD simulations? or is it just a C++/coding related cautionary comment?

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October 4, 2023, 12:26		#2
2538sukham Member Michael Sukham Join Date: Mar 2020 Location: India Posts: 84 Rep Power: 6	Have you worked it out? Because I had the same problem regarding the compression flux. In foamExtend, it is not there. It is a bit hard to figure out without having a test case .