# Rotating wall velocity boundary condition for axisymmetric flow problem

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February 28, 2013, 02:00
Rotating wall velocity boundary condition for axisymmetric flow problem
#1
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Anant Diwakar
Join Date: Jan 2013
Posts: 68
Rep Power: 6
Hello

I am trying to solve flow between two rotating cylinders having a rotating
circular ring in the annulus. The cylinder walls and the ring are rotating
with different angular velocities. I have taken a wedge shape domain
with front and back faces as "periodic walls". This type of flow has
non-zero swirl, radial and axial velocities, which do not vary with azimuthal angle.

The walls are kept as some temperatures, say 300 K.

Hence I wanted to know whether we can apply rotating wall velocity
conditions at different walls, in non-rotating frame of reference, in SU2 ?

Also, I wanted to know whether we can have single cell in the azimuthal
direction ? (between periodic front and back walls)

The schematic of the problem is attached with the post.

Thanks
Anant
Attached Files
 schematic.pdf (10.1 KB, 62 views)

March 24, 2013, 00:45
#2
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Francisco Palacios
Join Date: Jan 2013
Location: Long Beach, CA
Posts: 359
Rep Power: 7
Quote:
 Originally Posted by diwakaranant Hello I am trying to solve flow between two rotating cylinders having a rotating circular ring in the annulus. The cylinder walls and the ring are rotating with different angular velocities. I have taken a wedge shape domain with front and back faces as "periodic walls". This type of flow has non-zero swirl, radial and axial velocities, which do not vary with azimuthal angle. The walls are kept as some temperatures, say 300 K. Hence I wanted to know whether we can apply rotating wall velocity conditions at different walls, in non-rotating frame of reference, in SU2 ? Also, I wanted to know whether we can have single cell in the azimuthal direction ? (between periodic front and back walls) The schematic of the problem is attached with the post. Thanks Anant
Dear Anant,
Thanks you for your interest in SU2. The current implementation v2.0.2 requires a hub, and at least 3 cells in the azimuthal direction.

It is very easy to impose a different velocity to each surface with a small modification of the subroutine
void CNSSolution::BC_NS_Wall(CGeometry *geometry, CSolution **solution_container, CNumerics *solver, CConfig *config, unsigned short val_marker)

or

void CEulerSolution::BC_Euler_Wall(CGeometry *geometry, CSolution **solution_container, CNumerics *solver, CConfig *config, unsigned short val_marker)

for inviscid flows.

both subroutines are in solution_direct_mean.cpp

Best,
Francisco

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