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#1 |
New Member
Peter
Join Date: May 2019
Posts: 13
Rep Power: 7 ![]() |
Hi,
I am wondering why isn't my Mach number match the non-dimensional velocity. It seems SU2 uses different speed of sound definitions. Did I set something wrong? Code:
-- Models: +------------------------------------------------------------------------------+ | Viscosity Model| Conductivity Model| Fluid Model| +------------------------------------------------------------------------------+ | CONSTANT_VISCOSITY| CONSTANT_PRANDTL| STANDARD_AIR| +------------------------------------------------------------------------------+ -- Fluid properties: +------------------------------------------------------------------------------+ | Name| Dim. value| Ref. value| Unit|Non-dim. value| +------------------------------------------------------------------------------+ | Viscosity| 1.716e-05| 397.679| N.s/m^2| 4.31504e-08| +------------------------------------------------------------------------------+ | Prandtl (Lam.)| -| -| -| 0.72| | Prandtl (Turb.)| -| -| -| 0.9| +------------------------------------------------------------------------------+ | Gas Constant| 287.058| 287.058| N.m/kg.K| 1| | Spec. Heat Ratio| -| -| -| 1.4| +------------------------------------------------------------------------------+ -- Initial and free-stream conditions: +------------------------------------------------------------------------------+ | Name| Dim. value| Ref. value| Unit|Non-dim. value| +------------------------------------------------------------------------------+ | Static Pressure| 114374| 114374| Pa| 1| | Density| 1.38273| 1.38273| kg/m^3| 1| | Temperature| 288.15| 288.15| K| 1| | Total Energy| 264708| 82715.8| m^2/s^2| 3.20021| | Velocity-X| 340.297| 287.603| m/s| 1.18322| | Velocity-Y| 0| 287.603| m/s| 0| | Velocity-Z| 0| 287.603| m/s| 0| | Velocity Magnitude| 340.297| 287.603| m/s| 1.18322| +------------------------------------------------------------------------------+ | Viscosity| 1.716e-05| 397.679| N.s/m^2| 4.31504e-08| | Conductivity| -| 114157| W/m^2.K| -| | Turb. Kin. Energy| 17.3703| 82715.8| m^2/s^2| 0.00021| | Spec. Dissipation| 139968| 287.603| 1/s| 486.67| +------------------------------------------------------------------------------+ | Mach Number| -| -| -| 1| | Reynolds Number| -| -| -| 7.90512e+06| +------------------------------------------------------------------------------+ |
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#2 |
Senior Member
Pedro Gomes
Join Date: Dec 2017
Posts: 466
Rep Power: 13 ![]() |
The non-dimensionalisation can only force a certain number of properties to 1, the option that gives you the reference velocity equal to speed of sound (DIMENSIONAL, FREESTREAM_PRESS_EQ_ONE, FREESTREAM_VEL_EQ_MACH, FREESTREAM_VEL_EQ_ONE) does not make the non-dim free stream pressure equal to 1.
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