Vortex boundary condition in OpenFOAM

cccm · January 1, 2018, 01:49

Greetings Foamers and happy new year

Please I need help on how to set a boundary condition which are singular vortices located at the bottom of my 2D simulation? . I'm thinking about an angular velocity multiplied by a radius of these vortices? is that easy to implement?.

Thank you happy new 2018

piu58 · January 1, 2018, 03:22

you may set the boundaries as a moving wall, similar to the lid driven cavity example. You have to set a tangential velocity at each plane. Please keep in mind: The velocity in the volume will me much lower than the one of the boundary, because the flow is mediated per friction only. You may look at the lid driven cavity for this aspect.

Santiago · January 1, 2018, 13:33

Fluid Turbulence in 2D? Can you be a bit more specific on what you seek to do?

January 1, 2018, 01:49	Vortex boundary condition in OpenFOAM	#1
cccm New Member Join Date: Mar 2017 Posts: 3 Rep Power: 9	Greetings Foamers and happy new year Please I need help on how to set a boundary condition which are singular vortices located at the bottom of my 2D simulation? . I'm thinking about an angular velocity multiplied by a radius of these vortices? is that easy to implement?. Thank you happy new 2018 Last edited by cccm; January 14, 2018 at 16:16.

January 1, 2018, 03:22		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	you may set the boundaries as a moving wall, similar to the lid driven cavity example. You have to set a tangential velocity at each plane. Please keep in mind: The velocity in the volume will me much lower than the one of the boundary, because the flow is mediated per friction only. You may look at the lid driven cavity for this aspect. cccm likes this. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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January 1, 2018, 13:33		#3
Santiago Senior Member Santiago Lopez Castano Join Date: Nov 2012 Posts: 354 Rep Power: 16	Fluid Turbulence in 2D? Can you be a bit more specific on what you seek to do?