[jomunkas]

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?

-- 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|
+------------------------------------------------------------------------------+

[pcg]

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.