Cubic scheme and spurious oscillation in velocity. Any alternative? -- CFD Online Discussion Forums

December 21, 2016, 01:32

Cubic scheme and spurious oscillation in velocity. Any alternative?

Lorenzo92

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Lorenzo

Join Date: Oct 2015

Location: Graz

Posts: 49

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Dear Collegues,

I'm currently facing undesired spurious oscillation in velocity solution in a DNS performed with cubic scheme (OF 4.0). Some images are attached.
My question to you: according to your knowledge is this behaviour related to the Courant number ( and so to the timeStep ) or is it a matter of mesh resolution ( so a spatial resolution issue).
Thank you for your attention and your help

Some details: mesh grid size around 0.2 mm and fixed timeStep adopted is 1e-5s. Temporal scheme is implicit backward. Spatial discretization scheme is cubic (4th order). The same issue does not arise with linear scheme ( 2nd order)

Attached Images

	Uz.png (90.1 KB, 19 views)
	Uy.png (94.4 KB, 16 views)
	Ux.png (100.4 KB, 13 views)
	Umag.png (100.7 KB, 13 views)
	p.png (50.3 KB, 10 views)

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