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I need to help solving supersonic transverse flow and error

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Old   October 9, 2014, 09:51
Default I need to help solving supersonic transverse flow and error
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LJH
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LEE JEONGHOON
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Dear all,

I'm doing a analysis of supersonic transverse flow with stinger shape injector. but i have lot of problem which is occured by error

My problem is a compressible and 2 inlet and 1outlet. The conditions given to my problem are

mainstream(air)
  • Total pressure at the inlet is 800000 Pa
  • Static pressure at the inlet is 21778 pa (M# : 3.0)
  • Static pressure at the outlet is 21778 Pa
  • Total temperature is 300 K
  • Isentropic and Ideal gas
Injector(helium)
  • Total pressure at the injector inlet is 10138669 pa
  • Static pressure at the injector outlet is 493847.8 Pa (M# : 1.0)
  • Total temperature is 300 K
  • Isentropic and Ideal gas
  • Ideal gas
Model
  • Energy Equation
  • viscous - SST k-omega
  • Species - Species Transport
but, when I analize this problem, I faced this error

temperature limited to 1.000000e+00 in 7 cells on zone 16
time step reduced in 10 cells due to excessive temperature change
(My coorant Number is 0.5, and also Positivity rate limit is 0.4)

I want to know why this error is occured and how to solve this error.

I wonder if there is anyone who could help me.

Thanks,

LJH
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