hello, can someone help me
 

hello,

can someone help me in implementing 'calculated' pressure condition on 'adiabatic wall' . I have an obstacle in the flow which has to be adaiabatic but i don't want to impose any condition of p on that. I tried to use 'calculated' primitive type with no physical type specified on obstacle and zeroGradient for T and U. It shows the following error:
Reading field p



--> FOAM FATAL IO ERROR : keyword value is undefined in dictionary "/home/user/skolan/OpenFOAM/skolan-1.3/run/tutorials/sonicFoam/backwardStep/0/p: :obstacle"

file: /home/user/skolan/OpenFOAM/skolan-1.3/run/tutorials/sonicFoam/backwardStep/0/p:: obstacle from line 58 to line 58.

From function dictionary::lookupEntry(const word& keyword) const
in file db/dictionary/dictionary.C at line 152.

FOAM exiting