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-   -   Odd behaviour in wigleyHull in OF 2.0 (http://www.cfd-online.com/Forums/openfoam-solving/90626-odd-behaviour-wigleyhull-2-0-a.html)

msbealo July 16, 2011 05:53

Odd behaviour in wigleyHull in OF 2.0
 
1 Attachment(s)
Hi,

I'm working on a virtual tow tank (for an MSc project) and have recently started to convert my interFoam test case into a LTSInterFoam case. I've been using the wigleyHull case as an example for this conversion.

Cutting to the chase, I was a little confused with the choice of boundary conditions so I ran the wigleyHull case without the snappyHexMesh stage (to give a simple channel) just to see what happens. Well..

..I see waves.. (see attached image).

The only change I make to the tutorial case is I edit the AllRun file to read:
Code:

#!/bin/sh
cd ${0%/*} || exit 1    # run from this directory

# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions

runApplication blockMesh
# runApplication snappyHexMesh -overwrite
# if [ ! -e log.transformPoints ]
# then
#    transformPoints -scale '(2 1 1)' > log.transformPoints 2>&1
# fi
cp 0/alpha1.org 0/alpha1
runApplication setFields
runApplication `getApplication`

i.e. I remove the snappy command which reduces the problem to a simple flow case. After 2000 steps (standard run time) I start to see instabilities in the flow. This confused me as I thought that it would be a pretty simple flow. Then, after extending the time to 10,000 steps I see crashing waves.

Could anyone shed any light on this behaviour?

Kind Regards,

Mark

P.S. Could someone also let me know who the original author of the wigleyHull case is? That would be quite useful to me.


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