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A question about modeling unsteady turbine cascade

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Old   August 6, 2015, 10:10
Question A question about modeling unsteady turbine cascade
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Cheung
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Dear everybody,
I'm trying to simulating a one-stage turbine cascade by using Transient Blade Row Model, and I've chosen the Time transformation model. But when I go to every timesteps of this simulation , I've obtain Notice as follows:
+--------------------------------------------------------------------+
| ****** Notice ****** |
| The non-dimensional near wall temperature (T+) has been clipped |
| for calculation of Wall Heat Transfer Coefficient. |
| |
| Boundary Condition : S_R Side 2 |
| T+ clip value = 1.0000E-10 |
| |
| If this situation persists and you are using the High Speed Model, |
| consider enabling Mach number based blending between low speed and |
| high speed wall functions. You can do so by specifying a Mach |
| number threshold as follows: |
| |
| EXPERT PARAMETERS: |
| highspeed wf mach threshold = 0.1 # default=0.0 (off) |
| END |
+--------------------------------------------------------------------+

So I want to ask you about this notice: What does this notice means? And I have found the expert parameter "highspeed wf mach threshold" in the settings but I cannot found it.where can I find this expert parameter?
Thank you for your any reply.
Neuerzh,
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near wall temperature, notice, transient blade row, unsteady


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