Handling of diffusion flux terms at the boundaries with QUICK scheme -- CFD Online Discussion Forums

January 18, 2020, 03:19

Handling of diffusion flux terms at the boundaries with QUICK scheme

Farhad9

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Farhad Hasanli

Join Date: Jan 2020

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Hello everyone,

It's my first time posting here, so I am sorry if I am not posting in the proper forum or for any other mistakes I may have made.
So, my question is about the theory of the QUICK scheme. While reading Versteeg and Malalasekera's book "An Introduction to Computational Fluid Dynamics: The Finite Volume Method", I have encountered a problem with the handling of the diffusion boundary terms. The explanation for the equation seems a bit vague. I have attached two pictures. It seems like eq. 5.54 for diffusion flux at the boundaries emerged out of nowhere. I have tried to find online about this issue, but with no success. I would appreciate it if someone could explain the reasoning behind that formula.

Thank you in advance

Attached Images

	82382161_2734765026561326_7415605510101008384_n.jpg (54.5 KB, 57 views)
	82618104_481003135941077_2729037393997856768_n.jpg (55.2 KB, 46 views)

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