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April 17, 2016, 04:44
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Monitoring Pressure Drop
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#1 |
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Member
Rahul
Join Date: Sep 2015
Posts: 39
Rep Power: 10  |
I want to simualte air flow pattern in a muffler.For that i will monitor value of pressure drop between the inlet and the outlet
Turbulence Model-SST Fluid-Air at 25 Degree Celsius Boundary Conditions: mass flow rate-inlet-0.2194kg/sec pressure-outlet-Relative static pressure is set to 0 Pa I defined a expression in CFX as areaAve(Pressure)@REGION:INLET-areaAve(Pressure)@REGION:OUTLET Now what my problem is CFX reports the value of Pressure drop to be 1.2E-08 !! Could anybody please help me in this regard? Last edited by raghulvr; April 18, 2016 at 21:18. |
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April 17, 2016, 06:31
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#2 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,701
Rep Power: 143 |
This is an FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
Some possibilities: * What units is the 1.2e-8 in? * Did you set the flow rate and geometry size correctly? * What is the dynamic head at the inlet and outlet? Does that explain the difference? * Otherwise the FAQ lists lots of other issues. Inadequate mesh resolution is the problem in 95% of questions on accuracy in my experience, by the way 
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April 17, 2016, 08:42
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#3 |
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Member
Rahul
Join Date: Sep 2015
Posts: 39
Rep Power: 10 |
Thank you so much for the reply
I have given all the details regarding my simulation Last edited by raghulvr; April 18, 2016 at 21:21. |
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April 17, 2016, 08:48
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#4 |
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Member
Rahul
Join Date: Sep 2015
Posts: 39
Rep Power: 10 |
the difference in dynamic head between inlet and the outlet is 4.700KPa-this is result given in the literature
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April 20, 2016, 02:19
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#5 |
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New Member
Rokson K Mathew
Join Date: Feb 2016
Posts: 9
Rep Power: 10 |
I would suggest a pressure inlet, mass flow outlet
inlet pressure- 1 atm (101325 Pa) To monitor pressure drop in the system, Total Pressure would do fine. (massFlowAve(Total Pressure in Stn Frame )@Inlet - massFlowAve(Total Pressure in Stn Frame )@Outlet) Try using this expression Cheers! |
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April 24, 2016, 12:06
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#6 |
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Member
Rahul
Join Date: Sep 2015
Posts: 39
Rep Power: 10 |
Thank you so much for your inputs Mathew
Cheers! |
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| cfx, muffler, pressure drop |
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