# Fluent cyclone pressure drop

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 LinkBack Thread Tools Search this Thread Display Modes
 January 29, 2018, 14:46 Fluent cyclone pressure drop #1 Member   Join Date: Oct 2016 Posts: 31 Rep Power: 9 Hello friends. https://www.youtube.com/watch?v=dalhTs4-0-c I am trying to calculate the pressure drop and cyclone efficiency with fluent cyclone analysis of the video. I use 1,200,000 hexa mesh in ICEM CFD. Turbulence model RSM model, I use Pressure Velocity Coupling-SIMPLE, Pressure-PRESTO, Momentum-QUICK and Second Order Upwind. I start with the steady solver to drive the flow, and then I use transiet. I calculate the pressure loss too much compared to the experimental data. I could not figure out where I was wrong. I will have some questions . 1 - How is total and static pressure loss calculated ? a or b -a) Surface integral - mass weighted average, Total pressure drop = inlet total pressure - outlet total pressure -b) volume integral mass average, total pressure loss = Total Pressure is Fluid 2 - When the input speed is 12.69m / s, the fluent output speed is calculated more. Since the output area is larger than the input area, the output speed must be smaller than the input speed. Where can the problem? 3 - Compared to the Fluent surface integral, the static pressure loss accounts for more than the total pressure loss. Can someone explain this to me. Please help me .

 February 2, 2018, 12:38 #2 Member   Join Date: Oct 2016 Posts: 31 Rep Power: 9 I have read the cfd-online forum from start to finish. But I could not find the answers to the questions I asked. can somebody please help me?

February 2, 2018, 14:30
#3
Member

ram
Join Date: Apr 2013
Posts: 37
Rep Power: 13
Quote:
 Originally Posted by mkal Hello friends. https://www.youtube.com/watch?v=dalhTs4-0-c I am trying to calculate the pressure drop and cyclone efficiency with fluent cyclone analysis of the video. I use 1,200,000 hexa mesh in ICEM CFD. Turbulence model RSM model, I use Pressure Velocity Coupling-SIMPLE, Pressure-PRESTO, Momentum-QUICK and Second Order Upwind. I start with the steady solver to drive the flow, and then I use transiet. I calculate the pressure loss too much compared to the experimental data. I could not figure out where I was wrong. I will have some questions . 1 - How is total and static pressure loss calculated ? a or b -a) Surface integral - mass weighted average, Total pressure drop = inlet total pressure - outlet total pressure -b) volume integral mass average, total pressure loss = Total Pressure is Fluid 2 - When the input speed is 12.69m / s, the fluent output speed is calculated more. Since the output area is larger than the input area, the output speed must be smaller than the input speed. Where can the problem? 3 - Compared to the Fluent surface integral, the static pressure loss accounts for more than the total pressure loss. Can someone explain this to me. Please help me .
I suggest you to use k-e RNG with modification in viscosity (if I remember correctly) , and 2nd order not QUICK for equations. Steady solutions can be used for cyclone, why transient that brings some hardships?
For question 1, a is correct. Also you can refer to literature for that

 February 2, 2018, 15:28 #4 Member   Join Date: Oct 2016 Posts: 31 Rep Power: 9 Thank you for your reply. Transient convergence is easier. I am using speed input and static pressure output boundary conditions. Why is the static pressure drop greater than the total pressure drop? why is the output speed larger when the output area is larger? CFX gives the same results. How do calculate Fluent or CFX pressure ? How should I interpret the results? Any advice on this will be appreciated.

 February 5, 2018, 13:05 #5 Member   Join Date: Oct 2016 Posts: 31 Rep Power: 9 Friends found the source of the incorrect results. Fluent saw the scale in cm. Now the results are of reasonable value. But the fluent output speed and the dynamic pressure again calculate incorrectly. How should I calculate the total pressure drop? should I calculate the outlet dynamic pressure value by ignoring the value that Fluent calculated? The output speed and the dynamic pressure CFX are also calculated incorrectly. I have not found a cause. Please give me a little tip.

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post xerox FLUENT 1 October 16, 2019 08:55 alireza_b FLUENT 2 May 29, 2013 08:51 pierresandre FLUENT 24 November 8, 2011 14:32 mk_mard STAR-CCM+ 3 August 29, 2011 02:06 elogesh Main CFD Forum 2 January 5, 2007 12:30

All times are GMT -4. The time now is 02:37.

 Contact Us - CFD Online - Privacy Statement - Top