# rotating propeller in stationary baffled vessel

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 October 14, 2010, 08:22 #21 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,160 Rep Power: 32 I don't know what you want to compute... __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 14, 2010, 11:49 #22 New Member   anonymous Join Date: Oct 2010 Posts: 8 Rep Power: 8 Ohh.. i would need to calculate the velocity contour within the mixing tank and would like to use the MRF method to solve the problem. Can i know what are the boundary conditions? Thank you for your help so far!

 October 15, 2010, 01:19 #23 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,160 Rep Power: 32 Did you checked tutorial 9? (Using MRF) __________________ In memory of my friend Hervé: CFD engineer & freerider

 October 15, 2010, 15:25 #24 New Member   anonymous Join Date: Oct 2010 Posts: 8 Rep Power: 8 Hi Max, i did try out tutorial 9 and apply the same boundary condition as given. But my solution did not converge and it diverge after 1000 iteration. Skewness of the cell is also < 0.6.. so i guess there must be some conditions that i did not set, that had cause the solution to diverge. Please enlighten. Thanks in advance

 October 18, 2010, 00:59 #25 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,160 Rep Power: 32 Check display of velocity contour and pressure --> are they in agreement with your expectations? Check also mass conservation (report/ mass-flow) __________________ In memory of my friend Hervé: CFD engineer & freerider

March 29, 2011, 15:09
#26
Senior Member

raymond
Join Date: Nov 2009
Posts: 149
Rep Power: 9
Quote:
 Originally Posted by -mAx- so I received your file. Do followings: *delete volume2 *create cylinder (height 0.2 / radius 1=radius 2=0.04 / Axis Location Positive Z) *split volume1 with the cylinder (volume4) *delete volume5 (solid) --> should be already deleted (volume2) but it's early this morning, don't want to investigate ) here we are, you have 2 regions: rotor and stator. *copy volume1 with translation (0.1 0 0) (it generates volume 5), delete volume1 *move copied volume5 with translation (-0.1 0 0) * The 2 volumes are now disconnected. Apply interfaces (one for each volume)

Hi, max. For the splitting step, is there any effect if different sizes of cylinders have been used? The sizes of cylinders have been attached as follow. Please have a look and thanks for help.
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 March 30, 2011, 01:19 #27 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,160 Rep Power: 32 no influence But I would extrude the inner cylinder through the whole domain (along your revolution axis) __________________ In memory of my friend Hervé: CFD engineer & freerider

March 30, 2011, 01:22
#28
Senior Member

raymond
Join Date: Nov 2009
Posts: 149
Rep Power: 9
Quote:
 Originally Posted by -mAx- no influence But I would extrude the inner cylinder through the whole domain (along your revolution axis)
thanks for help, max.

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