|April 10, 2013, 06:24||
Water pipe - pressure inlet/outlet - unrealistic velocities
Join Date: Mar 2013
Posts: 22Rep Power: 6
I am running a simple test to verify flow rates of water though a pipe (0.6 m long and 3mm diameter) using known pressures for inlet and outlet.
The inlet has a totalPressure of 106325 Pa and the outlet (fixedValue) 101325 Pa.
The velocity is calculated via pressureInletVelocity.
The kinematic viscosity is set to 1e-6
The current solver is simpleFoam
The experimental flow rate of this setup is around 1 litre per hour --> velocity in flow direction of around 0.04 m/s.
simpleFoam converges in about 1200 iterations but the magnitude of the flow is 99 m/s.
Why is the velocity so high using simpleFoam?
|April 11, 2013, 07:08||
Join Date: Mar 2009
Location: Campinas, Brasil
Posts: 151Rep Power: 10
In simpleFoam what is called pressure is in fact pressure divided by the specific mass (check the units). This may be the cause of the strange results that you've got.
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