CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Visualization & Post-Processing Software > EnSight

How to Calculate Mass Flow Through Boundary

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By Marina G

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 22, 2015, 17:12
Default How to Calculate Mass Flow Through Boundary
  #1
New Member
 
Venkatesh V
Join Date: Sep 2009
Posts: 24
Rep Power: 16
cfdvenkatesh is on a distinguished road
I have transient data loaded into EnSight. How to I calculate mass flow through inlet boundary and plot it in graph.
Also I would like to animate the graph by highlighting mass flow at current time.
cfdvenkatesh is offline   Reply With Quote

Old   June 23, 2015, 15:40
Default
  #2
Member
 
Marina G's Avatar
 
Marina Galvagni
Join Date: Apr 2014
Location: North Carolina, USA
Posts: 58
Rep Power: 11
Marina G is on a distinguished road
Hi,

Select your inlet boundary part in the part list. Open the calculator tool (icon at the top-left). If you have the density field, then calculate Momentum = velocity*density. Then, calculate the Mass flow by using the "Flow" function (that calculates the Surface integral of the input vector field) setting Momentum as the vector field. Give a look at this link for more details on the Flow calculations (in particular, point b) focuses on Mass flow calculations):

https://support.ceisoftware.com/hc/e...-using-EnSight

You should now have created a new variables that is your Mass flow. It will appear in the variable list (bottom-left) under Constants - in EnSight, "constants" means constant in space, not in time. Right-click on it and select "Plot vs. time". The plot of the flow vs. time will appear on the viewport. If you change timestep, the vertical line corresponding to the time at which you are will update automatically.

Would you have more questions or problems, let us know.
Best Regards,

Marina Galvagni
CEI Software Engineer Support
Marina G is offline   Reply With Quote

Old   March 15, 2018, 10:16
Default
  #3
New Member
 
Hiren Tala
Join Date: Oct 2016
Posts: 22
Rep Power: 9
hiren tala is on a distinguished road
I have to calculate massflow rate of Co2 out of mixture of 5 gases available in the pipe at the one cross sectional surface. how can i show and calculate perticular for one gas only? what you mensioned above is for Total massflowrate.
Any reply will be appreciable.
thanks in advance
hiren tala is offline   Reply With Quote

Old   March 15, 2018, 10:47
Default
  #4
Member
 
Marina G's Avatar
 
Marina Galvagni
Join Date: Apr 2014
Location: North Carolina, USA
Posts: 58
Rep Power: 11
Marina G is on a distinguished road
Hi,

I assume you have quantities such as: density of the gas (scalar field), species concentration for the gas component you're interested in (scalar field), gas velocity (vector field). And, you have a 2D part which is the cross section where you want to calculate the mass flow.

In this case, first create a new variable:

species_momentum = species concentration * density * velocity

This will be a vector field that is the momentum for only that species, not the whole gas.
Now calculate the Flow and FlowRate using this species_momentum instead of the velocity.

Give a look at

https://support.ceisoftware.com/hc/e...-using-EnSight

for more details on the flow calculations in EnSight.
Best Regards,

Marina Galvagni
CEI Software Support Engineer
tbraun84 likes this.
Marina G is offline   Reply With Quote

Old   March 16, 2018, 06:49
Default
  #5
New Member
 
Hiren Tala
Join Date: Oct 2016
Posts: 22
Rep Power: 9
hiren tala is on a distinguished road
thank you so much
i got it
hiren tala is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
sliding mesh problem in CFX Saima CFX 46 September 11, 2021 08:38
Wind turbine simulation Saturn CFX 58 July 3, 2020 02:13
Domain Reference Pressure and mass flow inlet boundary AdidaKK CFX 75 August 20, 2018 06:37
Modeling interface of fluid and porous, not with default setting ftab CFX 27 May 20, 2014 07:58
why my momentum and mass not convergence wwwuxing CFX 3 May 18, 2012 08:49


All times are GMT -4. The time now is 02:32.