fixedJump Boundary Condition Not Working

lordvon · August 25, 2014, 17:37

Hello all,
I have been trying to get the fixedJump boundary condition to work on a baffle surface. I wanted to cause a jump in pressure. The simulation runs fine, but it is as if the baffle is not there. I specify the jump in 0/p as follows:

Code:

    baffle
    {
   	type            fixedJump; 
    	patchType       cyclic; 
    	value           $internalField; 
    }
    baffleother
    {
    	type            fixedJump; 
	patchType       cyclic; 
	jump            uniform 1719; 
	value           $internalField;
    }

All other files have 'baffle' and 'baffleother' specified as cyclic. I do not get any errors or warnings when running or setting up. It is just that the pressure jump is not enforced; nothing happens at the baffle. I have tried flipping the baffle (option in the baffle dictionary) but it does not do anything...

Please help!!!

lordvon · August 25, 2014, 21:15

I solved it! Here are my fixes:

-'baffle' was the master patch, not 'baffleother', and the 'jump' should be defined on the master patch.

-After calling 'createBaffles', the '0/p' file was rewritten with values and jumps set to zero! For some reason, my uniform value for jump was replace by a nonuniform list of near-zero values for every face in the master baffle. So, I just had to replace the newly created '0/p' with the original.

August 25, 2014, 17:37	fixedJump Boundary Condition Not Working	#1
lordvon Senior Member Robert Join Date: Sep 2010 Posts: 158 Rep Power: 15	Hello all, I have been trying to get the fixedJump boundary condition to work on a baffle surface. I wanted to cause a jump in pressure. The simulation runs fine, but it is as if the baffle is not there. I specify the jump in 0/p as follows: Code: baffle { type fixedJump; patchType cyclic; value $internalField; } baffleother { type fixedJump; patchType cyclic; jump uniform 1719; value $internalField; } All other files have 'baffle' and 'baffleother' specified as cyclic. I do not get any errors or warnings when running or setting up. It is just that the pressure jump is not enforced; nothing happens at the baffle. I have tried flipping the baffle (option in the baffle dictionary) but it does not do anything... Please help!!!

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August 25, 2014, 21:15		#2
lordvon Senior Member Robert Join Date: Sep 2010 Posts: 158 Rep Power: 15	I solved it! Here are my fixes: -'baffle' was the master patch, not 'baffleother', and the 'jump' should be defined on the master patch. -After calling 'createBaffles', the '0/p' file was rewritten with values and jumps set to zero! For some reason, my uniform value for jump was replace by a nonuniform list of near-zero values for every face in the master baffle. So, I just had to replace the newly created '0/p' with the original.