How can rotate impeller in axial pump by using transient conditions in CFD?
Dear Ahmed Ramadhan Al-Obaidi ,
Please tell me more in detail about your problem....
Dear Ahmed Ramadhan Al-Obaidi ,
Please tell me more in detail about your problem....
Thank you very much Nazaruddin I have simulated 3D Axial flow pump with two parts stator and rotor when
Dear Ahmed Ramadhan Al-Obaidi
Most of the CFD software allows you to set the impeller rotation at the stage of setting the boundary conditions. The exact steps depend on the program.
For example, in Ansis CFX, you can set the impeller rotation as in the example
https://youtu.be/VgQ3mpfWolE
Or like in this example: http://cfd2012.com/ansys-cfx-pump-simulation.html
Kind regards.
Many thanks Andrii could you provide me examples in CFD fluent please
Dear Ahmed Ramadhan Al-Obaidi I couldn't find an example of the impeller rotation by using transient conditions in Fluent.
But, you can use this example: https://www.youtube.com/watch?v=YcwxtgScrac&t=183s
For use transient condition you can use UDF in Fluent User guide:
2.3.10.3. Example
The following UDF, named fmotion, computes the rotation rate of a cell zone, simulating start-up behavior. The angular velocity is increased linearly in time up to a flow time of 0.1 s, after which it remains constant. A constant translational velocity of 1 m/s in the X direction is assigned. The lines assigning the origin and axis vectors only repeat the default behavior, and could be omitted. The source can be interpreted or compiled.
#include "udf.h"
DEFINE_ZONE_MOTION(fmotion,omega,axis,origin,velocity,time,dtime)
{
if (time < 0.1)
{
*omega = 2500.0 * time;
}
else
{
*omega = 250.0;
}
N3V_D (velocity,=,1.0,0.0,0.0);
N3V_S(origin,=,0.0); /* default values, line could be omitted */
N3V_D(axis,=,0.0,0.0,1.0); /* default values, line could be omitted */
return;
}
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