CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Assessing steady state results for unsteady flows

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 10, 2016, 06:20
Default Assessing steady state results for unsteady flows
Senior Member
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 712
Rep Power: 24
siw will become famous soon enough

I know this is very simulation dependent but it will be useful to have comments from the experienced CFX community.

My model is of an internal flow (ducts and filters) which I have simulated as steady state with a range of mass flow rates to plot the system pressure loss against the fan performance curve; the fan is downstream of my system and not included in the model. However, for all the simulations the residuals and monitor points (velocity and pressure at many points in the system) show the flow is unsteady. But I do not have enough time to simulate any transient cases; the timestep and endtime would be choices to make as well.

As this is a common situation with industrial CFD (complex flowfields but little time to solve them suitably) then how do others assess steady state solution results for unsteady flows? For example; I need to report the pressure drop across the system but the outlet pressure is unsteady, the inlet is just atmosphere. Strictly, the monitor point plot is not giving a fluctuating pressure to take a max/min/mean from.

siw is offline   Reply With Quote


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
POPULATION BALANCE MODELING (PBM) in Steady State osha Fluent Multiphase 1 June 18, 2022 07:22
unsteady state to steady state neetu kumari OpenFOAM 4 June 14, 2016 18:16
Time Increment Significance in Steady state FEM CFD solvers? Abhya Main CFD Forum 1 October 14, 2015 20:07
Steady state simulation with transient partilcle tracking mali28 FLUENT 2 February 7, 2013 14:25
About the difference between steady and unsteady problems Lisa Main CFD Forum 11 July 5, 2000 14:37

All times are GMT -4. The time now is 22:39.