What type of pump?
Can you post a picture of the resulting curve?
It is a centrifugal pump type with head decreasing as the flow rate increases
We donot know what BC's to be given so that we can obtain the flow rate and the total pressure at the pump exit.
You can always measure the pressure and flow rate at outlet. And everything will depends on the inputs you give.
Just under results, RMB on surface parameter and select insert. Then select the face/surface at outlet and get the parameters like pressure, temperature, flow rate, etc.
I am interested to know what will be the Boundary Conditions that is to be specified to get the Outlet flow rate (Q) and Outlet Total pressure (H)
Anyway thanks for your reply
Keep an eye on the pump speed, as well. You want to take your measurements at a constant RPM, and control flow with a throttle valve on the outlet.
As far as volume, input = ouput (assuming no leakage), since most liquids are essentially incompressible. Make sure your volume measurement instruments are properly set up (i.e. venturi not too close to a bend or valve, typically at least 10x pipe diameter from nearest obstruction).
The pressure to measure is the differential pressure between inlet and outlet. You should record both inlet and outlet pressures or have a dP gage set up.Make sure inlet pressure is high enough to avoid cavitation.
If you are getting good data, 4 or 5 data points between full open and full shut should be sufficient. I would be more comfortable with 10 to 12.
It sounds like you set up the geometry of the pump housing and then applied a range of inlet flow rates. Flow sim would then compute the back pressure at each flow rate, giving a curve where the pressure drop rises with rising flow rate.
What I think you are asking, is how to use Flow sim to simulate the pumping action of the rotating impeller?
Have you studied the 'Rotating Impeller' chapter in the Flow sim tutorial document?
Actually I have developed a new impeller & diffuser....to say a pump.
Now I donot know what is the pump characteristics Q Vs H.
To obtain that characteristics what would be the Boundary condition that I have to specify.
Initially I gave the above said Boundary condition but the pump characteristic (Q Vs H) is an increasing curve...but it should be a dropping curve.
I am getting the dropping curve from my experimental results.....so now to establish a standard procedure in Flow Simulation what is the Boundary condition that is to be specified......if anyone has tried out before....please help me
I think that you shall try tool called "Parametric study" to obtain pump characteristic.
It is located in FlowSimulation-> Tools-> Parametric study and give us possibility to compare flow characteristics depending on change in General Settings parameter (angular velocity in this case).
Set inlet and outlet as pressure openings, and compare flow characteristics changes by angular velocity change through Parametric study definition.
My first question is did u know how to solve the centrifugal pump simulation in the flow simulation? Did u used rotating region option in your problem i.e. for specifying the impeller rotation value i.e. RPM.
Go through the online tutorials reg impeller problem in the flow simulation.
you metioned that u r having experimental data with you, so take one of volume flow rate conditions or inlet or out let pressure conditions and solve the problem i.e. specify the inlet volume flow rate and out let conditions is the environment/static pressure.
if you want apply the varying input volume flow rate condition means, use time dependent option in the general settings and use dependency option i.e. specify the volume flow rate W.R.T to the time.
define the goals i.e. pressure head loss i.e. differences of inlet/oulet pressure conditions, volume flow rate conditions etc.
form the goals plot data you can manuallly plot the discharge vs head varying graphs.
kindly let me know if i am wrong.
This is what I wanted...... the Boundary conditions (BC) that are to be specified .
In this case I have experimental results but in cases where we develop certain theoretical models
and want to get the pump characteristics curve we should know what BC has to be given to obtain the correct result.
Presently I have given Inlet velocity and Static Pressure (Environmental)outlet - First Step => Output Goal is Flow rate
In second step I apply Static Pressure (Environmental) at inlet and get the total pressure difference between outlet and inlet => head.
Is this a right procedure.