[prasant]

Dear Foamers,

I am solving impeller case with compressible effects. I am posting my U, p and T files over here. I am getting very low temperature value at outlet. Due to this issue, Impeller efficiency is not coming correct. Please have a look at it and suggest me whether I am using correct boundary conditons or not. And also I am posting the thermophysical properties also.

U file:

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 1);

boundaryField
{
imp_default
{
type fixedValue;
value uniform (0 0 0);
}
imp_default_tip_side_small
{
type fixedValue;
value uniform (0 0 0);
}
imp_default_tip
{
type fixedValue;
value uniform (0 0 0);
}
imp_hub
{
type fixedValue;
value uniform (0 0 0);
}
imp_inlet
{
type pressureInletVelocity;
value uniform (0 0 0);
}
imp_shroud
{
type rotatingWallVelocity;//fixedValue;
axis (0 0 1);
origin (0 0 0);
omega constant 267.03538;
}
volute_default
{
type fixedValue;
value uniform (0 0 0);
}
volute_default_fine
{
type fixedValue;
value uniform (0 0 0);
}
volute_outlet
{
type flowRateInletVelocity;
massFlowRate -10.27;
rho rho;
rhoInlet 1.0;
}
volute_default_small
{
type fixedValue;
value uniform (0 0 0);
}
int_imp
{
type cyclicAMI;
value uniform (0 0 0);
}
int_volute
{
type cyclicAMI;
value uniform (0 0 0);
}
}


// ************************************************** *********************** //
p file

dimensions [1 -1 -2 0 0 0 0];

internalField uniform 101325;

boundaryField
{
imp_default
{
type zeroGradient;
}
imp_default_tip_side_small
{
type zeroGradient;
}
imp_default_tip
{
type zeroGradient;
}
imp_hub
{
type zeroGradient;
}
imp_inlet
{
type totalPressure;
p0 uniform 101325;
gamma 1.4;
}
imp_shroud
{
type zeroGradient;
}
volute_default
{
type zeroGradient;
}
volute_default_fine
{
type zeroGradient;
}
volute_outlet
{
type zeroGradient;
}
volute_default_small
{
type zeroGradient;
}
int_imp
{
type cyclicAMI;
value uniform 0;
}
int_volute
{
type cyclicAMI;
value uniform 0;
}

}


// ************************************************** *********************** //
T file

dimensions [0 0 0 1 0 0 0];

internalField uniform 300;

boundaryField
{
imp_default
{
type zeroGradient;
}
imp_default_tip_side_small
{
type zeroGradient;
}
imp_default_tip
{
type zeroGradient;
}
imp_hub
{
type zeroGradient;
}
imp_inlet
{
type totalTemperature;
T0 uniform 300;
gamma 1.4;
}
imp_shroud
{
type zeroGradient;
}
volute_default
{
type zeroGradient;
}
volute_default_fine
{
type zeroGradient;
}
volute_outlet
{
type zeroGradient;
}
volute_default_small
{
type zeroGradient;
}
int_imp
{
type cyclicAMI;
}
int_volute
{
type cyclicAMI;
}

}


// ************************************************** *********************** //
thermoPhysicalProperties

thermoType
{
type hePsiThermo;
mixture pureMixture;
transport sutherland;
thermo hConst;
equationOfState perfectGas;
specie specie;
energy sensibleEnthalpy;//InternalEnergy;
}

mixture
{
specie
{
nMoles 1;
molWeight 28.9;
}
thermodynamics
{
Cp 1005;
Hf 0;
}
transport
{
As 1.4792e-06;
Ts 116;
}
}


Thanks & Regards
Prasant.