curve

protocol · June 5, 2015, 07:43

i have a model in which in flow of very high mach number hits a curved surface
but after sometime the mach number shoots up i have relatively very mesh in that area please suggest what to do

fluid23 · June 5, 2015, 10:58

try ramping your boundary conditions up rather than specifying a constant value.

protocol · June 5, 2015, 13:51

what to do you mean by ramp boundary conditions i am now using expert solver the solution doesnt seem to be diverging now thank you for your advice can you tell me what you meanby ramp boundary conditions is it like periodic conditions?

me3840 · June 30, 2015, 00:08

No, he means if you have a final inlet velocity V, you specify the boundary condition:

velocity=V*currentIteration/numberOfRampingIterations

Or something of that nature. That way your inlet velocity (or whatever condition you're using) rises as your iteration count rises. You will also have to provide a condition on what to do when currentIteration==numberOfRampingIterations.

June 5, 2015, 07:43	curve	#1
protocol New Member Join Date: Feb 2015 Posts: 26 Rep Power: 11	i have a model in which in flow of very high mach number hits a curved surface but after sometime the mach number shoots up i have relatively very mesh in that area please suggest what to do

June 5, 2015, 13:51	boundary conditions	#3
protocol New Member Join Date: Feb 2015 Posts: 26 Rep Power: 11	what to do you mean by ramp boundary conditions i am now using expert solver the solution doesnt seem to be diverging now thank you for your advice can you tell me what you meanby ramp boundary conditions is it like periodic conditions?

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June 5, 2015, 10:58		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	try ramping your boundary conditions up rather than specifying a constant value.

June 30, 2015, 00:08		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	No, he means if you have a final inlet velocity V, you specify the boundary condition: velocity=V*currentIteration/numberOfRampingIterations Or something of that nature. That way your inlet velocity (or whatever condition you're using) rises as your iteration count rises. You will also have to provide a condition on what to do when currentIteration==numberOfRampingIterations.