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Solving forces & coeffs

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Old   May 2, 2012, 09:37
Default Solving forces & coeffs
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Sergey Zinkevich
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Hello every1!
I`ve troubles with solving forces an coeffs
I use SRFSimpleFoam :

"--> FOAM Warning :
From function void forces::read(const dictionary&)
in file forces/forces.C at line 309
Could not find Uabs, p in database. "

conrtolDict:
" {
type forces
functionObjectLibs ("libforces.so);
patches (MODEL);
pName p;
UName Uabs;
log true;
rhoName rhoInf;
rhoInf 1.225;
CofR (0 0 0);
outputControl timeStep;
outputInterval 1;
}"

Any help will be appreciated
Best regards,
Astarta
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Old   May 3, 2012, 02:58
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Hi,

just a guess from the information you provided:

Code:
patches (MODEL);
pName p;
UName Uabs;
do these three entities contain the name of the patch
you want to calculate the forces on (patch) and the name
of the file specifying the pressure values (pName) and
velocity values (UName)
and are these files located in a folder named 0,
for the problem is:

Code:
Could not find Uabs, p in database
and the question is y? usually this is a naming or storing issue.

I hope I could contribute
regards
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Old   May 4, 2012, 05:08
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Sergey Zinkevich
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Thanks! It helped, noweverything`s ok!
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Old   March 9, 2017, 08:45
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Niranjan Prabhu
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--> FOAM FATAL IO ERROR:
keyword origin is undefined in dictionary "/home/user/OpenFOAM/user-2.4.0/run/work/3_waveflume/system/controlDict.functions.forces"

file: /home/user/OpenFOAM/user-2.4.0/run/work/3_waveflume/system/controlDict.functions.forces from line 10 to line 24.

forces
{
type forces;

functionObjectLibs ( "libforces.so" );

outputControl timeStep;
timeInterval 1;

log yes;

patches ( cylinder );
pName pd;
UName U;
rhoName rhoInf; // Indicates incompressible
log true;
rhoInf 1000;
}

any help please
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Old   March 9, 2017, 09:35
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Ricky
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Quote:
Originally Posted by niran View Post
--> FOAM FATAL IO ERROR:
keyword origin is undefined in dictionary "/home/user/OpenFOAM/user-2.4.0/run/work/3_waveflume/system/controlDict.functions.forces"

file: /home/user/OpenFOAM/user-2.4.0/run/work/3_waveflume/system/controlDict.functions.forces from line 10 to line 24.

forces
{
type forces;

functionObjectLibs ( "libforces.so" );

outputControl timeStep;
timeInterval 1;

log yes;

patches ( cylinder );
pName pd;
UName U;
rhoName rhoInf; // Indicates incompressible
log true;
rhoInf 1000;
}

any help please
centre of rotation is missing in your forces functionObject.

Code:
CofR (0 0 0) // also depends on your case
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Old   March 9, 2017, 10:31
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Niranjan Prabhu
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thank you KERA now it is running

CofR required ?
In waves2Foam there is no p file i changed to pd which is available in this solver but unit of both p & pd are not same. Is any problem will come because of this?
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