CFD Online Discussion Forums - totalPressure boundary :Performance Curve (constant RPM)

Hi everyone,

i'm now working on simulation to generate a performance curve of a radial blower ( to be compared with the curve from manufacturer- see attachment) using simplefoam mrf (OF 2.2.0)

for the first simulation which i want to achieve maximum flow rate ( static pressure difference of inlet and outlet = 0) i used this totalPressure condition for both inlet and outlet (duct):

Code:

   type            totalPressure;

    rho none;

    psi none;

    phi phi;

    gamma 0;

    p0 uniform 0;

    value           uniform 0;

the result seems to be good.

for the next simulation i would like to increase the static pressure difference to 50 pascal. Which one from below initial condition for outlet is the right condition to be made?

0/p for Outlet

Code:

   type            totalPressure;

    rho none;

    psi none;

    phi phi;

    gamma 0;

    p0 uniform 50;

Code:

   type            totalPressure;

    rho none;

    psi none;

    phi phi;

    gamma 0;

    p0 uniform 50;

   value uniform 50;

Code:

   type            totalPressure;

    rho none;

    psi none;

    phi phi;

    gamma 0;

    p0 uniform 50;

   value uniform 0;

or should i use other type of outlet and inlet boundary?

I tend to use totalpressure since i can set the static pressure hence easier for me to obtain the static pressure difference without need to do extra calculation etc.

please correct me if i did wrong.

thank you in advance :)

regards,
nash