[psk]

Million Thanks Bruno, I check blockMesh it works fine. I can understand up to step 4.4 , the results are below

toshiba@ubuntu:~/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder$ ./Allrun 
Modifying /home/toshiba/.OpenFOAM/2.1.0/controlDict to enable allowSystemOperations
Enabling allowSystemOperations in /home/toshiba/.OpenFOAM/2.1.0/controlDict.
Running blockMesh on /home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder
Running potentialFoam on /home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder
Running streamFunction on /home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder
toshiba@ubuntu:~/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder$ potentialFoam -writep
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.1.0-0bc225064152
Exec   : potentialFoam -writep
Date   : Aug 19 2013
Time   : 17:04:41
Host   : "ubuntu"
PID    : 3157
Case   : /home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Reading field p

Reading field U


Calculating potential flow
Using dynamicCode for functionObject difference at line 53 in "/home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder/system/controlDict::functions::difference"
DICPCG:  Solving for p, Initial residual = 1, Final residual = 7.87068e-07, No Iterations 76
DICPCG:  Solving for p, Initial residual = 0.0126096, Final residual = 7.71198e-07, No Iterations 64
DICPCG:  Solving for p, Initial residual = 0.0025829, Final residual = 9.49278e-07, No Iterations 59
DICPCG:  Solving for p, Initial residual = 0.000902306, Final residual = 8.48077e-07, No Iterations 57
continuity error = 3.37204e-05
Interpolated U error = 1.1896e-05
Looking up field U

Reading inlet velocity  uInfX

U at inlet = 1 m/s
Cylinder radius = 0.499614 m

Evaluating analytical solution
Writing relative error in U to "/home/toshiba/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder/0/error"
ExecutionTime = 0.08 s  ClockTime = 0 s

End

toshiba@ubuntu:~/OpenFOAM/toshiba-2.1.0/run/tutorials/basic/potentialFoam/cylinder$

4.5

There is no other time folder, because potentialFoam is an extremely basic folder that loads and saves the results to the same time folder.

What it mean(there is no time folder) how I can see the results in paraview. whether I have to type foamToVTK?