November 2, 2022 at 10:46 pmimunganSubscriber
Hello. I am simulating ethylene fueled combustion case. I did aerodynamics analysis. In second analysis fuel injected into domain. While running i am facing reversed flow and temperature problem. However it did not crash. When iterations are finished, i navigate the result. The residual is not reasonable. What should i do? Thnak you in advanced.
You can see the screenshot of required info below.
November 3, 2022 at 7:49 amDrAmineAnsys Employee
Well the global scaled residuals you are sharing are telling me that the case did not converge and the results should not be trusted.
Are the inputs into you p-farfield correct? Where is it located?
November 3, 2022 at 8:28 am
November 3, 2022 at 9:07 amDrAmineAnsys Employee
I did not wrote they are incorrect: I wrote please check (espcially if the proper isentropic exponent is used there).
Are you using the pressure based solver?
November 3, 2022 at 9:09 amimunganSubscriber
density based solver
November 3, 2022 at 9:13 amDrAmineAnsys Employee
Makes sense. Can you list the model settings you are using. Thanks.
November 3, 2022 at 2:53 pmimunganSubscriber
Operating Pressure = 0
Density Based Solver
k-w sst - compressibility effect
species transport - volumetric - finite rate / no tci - thermal diffusion - ethylene/air
ethylene/air --> density: ideal gas - viscosity: ideal gas mixing law - mass diffusivity: kinetic theory - thermal diffusion: kinetic theory
air ---> density: ideal gas - viscosity: sutherland
inlet (pressure far field) --> P=5568,4 Pa - 4,5 Mach -T=436,4 K - Intensity and hydraulic = 5/0,0441 m - O2:0,232 h20:0,032
fuel (mass flow inlet) --> 5,8e-4 kg/s - 100666,8 Pa - total temp:300 K - intensity - hydraulic = 5/7,5e-4 m - c2h4=1
outlet --> intensity and hydraulic = 5 / 0,0675 m (rest is default)
high speed numerics enabled
November 3, 2022 at 3:14 pmimunganSubscriber
Implicit - Steady State
Gradient: Least squares cell based
flow: 2nd order
under-relaxations are default
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