Spurious Values when Probing (u,v)?

williamsj0165 · May 21, 2021, 15:16

I am running a simulation that simulates the flow over three rotating cylinders. I am probing the velocity and pressure at several locations in the wake downstream of the cylinders.

When plotting the velocities in MATLAB, I notice what appear to be spurious values of velocity; see the attachment below. Although this case is not very extreme, some probe locations return many spurious values.

u_t_spurious values.jpg

What could be the cause of this? Thank you for any thoughts or insight.

HPE · May 22, 2021, 10:24

Are those probes close to any boundary (including processor boundaries if the case is parallel)?

Might be useful for the community if you can provide a minimal reproducible example. There could even be a bug.

May 21, 2021, 15:16	Spurious Values when Probing (u,v)?	#1
williamsj0165 New Member n/a Join Date: Sep 2020 Posts: 5 Rep Power: 6	I am running a simulation that simulates the flow over three rotating cylinders. I am probing the velocity and pressure at several locations in the wake downstream of the cylinders. When plotting the velocities in MATLAB, I notice what appear to be spurious values of velocity; see the attachment below. Although this case is not very extreme, some probe locations return many spurious values. u_t_spurious values.jpg What could be the cause of this? Thank you for any thoughts or insight.

May 22, 2021, 10:24		#2
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 931 Rep Power: 13	Are those probes close to any boundary (including processor boundaries if the case is parallel)? Might be useful for the community if you can provide a minimal reproducible example. There could even be a bug. __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

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