Problem running angledDuct tutorial of porousSimpleFoam
 

Hello everyone,
I am quite new to cfd and presently trying to learn openfoam. While running the porousSimpleFoam solver for angledDuct tutorial problem, an error crops up as this:

Create time

Create mesh for time = 0


SIMPLE: no convergence criteria found. Calculations will run for 100 steps.

Reading field p

Reading field U



--> FOAM FATAL IO ERROR:
Please supply either 'volumetricFlowRate' or 'massFlowRate' and 'rho'

file: /home/anindya1/OpenFOAM/anindya1-3.0.0/run/tutorials/incompressible/porousSimpleFoam/porous/0/U.boundaryField.inlet from line 45 to line 47.

From function flowRateInletVelocityFvPatchVectorField::flowRateI nletVelocityFvPatchVectorField(const fvPatch&, const DimensionedField<vector, volMesh>&, const dictionary&)
in file fields/fvPatchFields/derived/flowRateInletVelocity/flowRateInletVelocityFvPatchVectorField.C at line 98.

FOAM exiting


Please help resolve the problem.
Also please suggest a way to modify the case for a flow through a pipe with porous medium in between.
Thanks in advance.