[@cfd]

hi guys. i am new foamer. i am really struggling to specify the inlet velocity as a parabolic function depending from space (so not from time!). Say for parabolic function as

v = -1.3 + 2.3x^2
I have tried two approaches that are explained in https://openfoam.org/release/2-1-0/b...me-dependent/:



First Approach:
i have computed v by matlab and created a two column data.csv file with in the 0th column have steps and in the 1st column having the value of v. After that i have done the following in 0/U in openfoam to read the csv file:

boundaryField
{
    inlet
    {
        type            uniformFixedValue;
        uniformValue    csvFile;
        uniformValueCoeffs
        {
                refColumns              0;
                componentColumns        (1);
                separator               ",";
                fileName                "data.csv";
        }
    }

After running the icoFoam, i get the following error:

Create time
  
Create mesh for time = 0
  
  
PISO: Operating solver in PISO mode
  
Reading transportProperties
  
Reading field p
  
Reading field U
  
  
  
--> FOAM FATAL IO ERROR: 
keyword nHeaderLine is undefined in dictionary "/home/laptop/OpenFOAM/of-dev/run/assignmentFlow/0/U.boundaryField.inlet.uniformValueCoeffs"
  
file: /home/laptop/OpenFOAM/of-dev/run/assignmentFlow/0/U.boundaryField.inlet.uniformValueCoeffs from line 29 to line 32.
  
From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const in file db/dictionary/dictionary.C at line 566.

Second Approach:

boundaryField
{
    inlet
    {
            type        uniformFixedValue;
            uniformValue    polynomial ((-1.3 0.0) (2.3 2.0));
    }

After running icoFoam, the following error is produced:

Create time
  
Create mesh for time = 0
  
  
PISO: Operating solver in PISO mode
  
Reading transportProperties
  
Reading field p
  
Reading field U
  
  
  
--> FOAM FATAL IO ERROR: 
Expected a '(' while reading VectorSpace<Form, Cmpt, Ncmpts>, found on line 26 the doubleScalar 0.1
  
file: /home/laptop/OpenFOAM/op-dev/run/assignmentFlow/0/U.boundaryField.inlet.uniformValue at line 26.
  
    From function Foam::Istream& Foam::Istream::readBegin(const char*)
    in file db/IOstreams/IOstreams/Istream.C at line 92.
  
FOAM exiting

can someone please help to debug these error?

is there any other way to insert inlet velocity as function of x in OpenFoam?

[Dipsomaniac]

Have a look at using groovyBC.

[@cfd]

Originally Posted by Dipsomaniac

Have a look at using groovyBC.

bit of a late reaction but groovyBC works fine! Thanx a lot!