CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

rotor/stator interaction

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   July 7, 2000, 05:08
Default rotor/stator interaction
Hyoungjin Kim
Posts: n/a
Hi colleagues,

I'm a beginer in turbomachinery flow analysis, and i 'm trying to analyze a flow field including one stage rotor/stator using a commercial CFD code(Fine/Turbo) assuming a steady flow. I selected a k-e model without wall function.

However, I found that my computational results deviates from an experiment at a wake region of the stator. Velocity profiles at the wake region does not agree with the experimental data.

My idea on one possible error source is that turbulent viscosities get reduced by an order of magnitude(from around 5 to 0.5 times miolecular viscosity ) when the flow crosses the rotor/stator boundary interface. The code employs the mixing plane method for the rotor/stator boundary, which averages pichwise variation of flow variables and puts them as inflow BC for a stator block.

Although it might be unavoidable in a computational viewpoint to average pitchwise disturbunces, the fact that values of turbulent viscosity are not continuous and jump down by one order of magnitute seems to me quite unnatural.

Also, I think the mixing plane method would always reduce turbulent viscosities and, therefore might cause similar problem with mine.

Would anybody answer me on this problem ?

Do I have to solve the flowfield with the code in unsteady mode without any pitchwise-averaging BCs to get consistent turbulent voscosity and accurate wake profile ?

Or does the magnitude of turbulent viscosity have little effect on wake velocity profiles, and I have another thing to be fixed ?

Thanks in advance.

Best Regards,


  Reply With Quote

Old   July 7, 2000, 05:29
Default Re: rotor/stator interaction
Joern Beilke
Posts: n/a
Rotor/Stator interaction is always transient. The only way to do such an analysis is a sliding mesh calculation.
  Reply With Quote

Old   July 7, 2000, 11:32
Default Re: rotor/stator interaction
John C. Chien
Posts: n/a
(1). I think, the first thing to do is to contact the support engineer of the software vendor. (2). The rotor/stator interaction simulation is an extremely complex problem. (3). Even for the single row simulation, there are flow separation, vortices, and complex secondary flow problems difficult enough to solve. (4). It is a research problem. And there is no simple answer to it.
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 11:38.