CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > Autodesk Simulation CFD

Actual vs Standard BC

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

LinkBack Thread Tools Search this Thread Display Modes
Old   February 7, 2016, 18:20
Question Actual vs Standard BC
New Member
Join Date: Nov 2015
Posts: 7
Rep Power: 10
rajcoep.88 is on a distinguished road

I tried to search about it before posting my doubt. But, I could not find anything which would clarify the things that are bugging me. It might seem like stupid question. But, I am new to CFD field.

When one does simulation of internal incompressible flow, then at inlet one should assign Mass flow rate or volume flow rate or velocity and gage pressure 0 at outlet. Lets say I want to assign Velocity at inlet. So this velocity is Standard or Actual Velocity

I have done test of pneumatic check valve. Flow meter gives reading of 6 Standard LPM (Standard Conditions written on flow meter are 20deg C and 1 Atm) and Pressure Drop across valve is 50 hPa. I want to verify same using Simulation. From Q=AV, I can calculate velocity. Pipe Internal Diameter is 4mm. But, people say standard and actual flow rates are different in case of air flow from what I have read. So which flow rate should I use to calculate Velocity so that I can give it as inlet boundary condition?

Thanks in advance!

Best Regards,
Rajdeep Rajput
rajcoep.88 is offline   Reply With Quote

Old   February 12, 2016, 22:11
New Member
Chris Fisichella
Join Date: Oct 2012
Posts: 28
Rep Power: 13
fisichel is on a distinguished road

So you did a test where you sent through air at nonstandard temperature and pressure and the meter reported flow rate in terms of standard temperature and pressure.

If you apply the standard atmospheric boundary conditions, then you should get nearly the same reading as the meter.

Matching test data requires some finesse. If you are comfortable using the adaptive meshing feature, I would turn it on.

Good luck,
fisichel is offline   Reply With Quote


air flow simulation, cfd analysis, check valve

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
Standard vs Actual Inlet Velocity as BC rajcoep.88 Main CFD Forum 3 February 8, 2016 08:47
Boiling simulation ( standard state enthalpy) yasir_hayyat Fluent Multiphase 1 October 13, 2014 03:31
Standard deviation for every time step shyam OpenFOAM Running, Solving & CFD 3 April 19, 2012 07:39
Standard K-Epsilon near wall treatment below y+ = 12 Shalash Main CFD Forum 4 February 2, 2012 16:43
about the unit of the standard state enthalpy!! KEVIN FLUENT 3 March 25, 2004 08:32

All times are GMT -4. The time now is 22:30.