Time intergrate of mass flow

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

 January 6, 2004, 01:50 Time intergrate of mass flow #1 Jackie Guest   Posts: n/a Hi all, I simulated an unsteady problem and like to know the total mass flow out at the portion interested. How could i calculate that value. Does CFX have the funtion to caculate it?. Sincerely, Jack

 January 6, 2004, 18:58 Re: Time intergrate of mass flow #2 Glenn Horrocks Guest   Posts: n/a Hi Jackie, What code are you using? I don't think there is a function to integrate mass flow rate over a transient simulation to give total mass loss/gain. You can get the mass flow rate at each time step in CFX-Post, so you could write a script to extract it for each time step. Alternatively in CFX5 you can make the mass flow rate at the current timestep an expression monitor point, and then you can easily extract the mass flow rate at each time step from the solver manager. Glenn

 January 7, 2004, 00:13 Re: Time intergrate of mass flow #3 Jeff Guest   Posts: n/a Jackie, Create your expression monitor point, as Glenn suggests. Right click on the monitor point graph in the solver manager and "export data to file". This is much easier than extracting the data from the results file. Import this data file into Excel and you can do a running integration of the mass flow (mass flow * dt + previous value). If you want to get fancy, use a trapezoidal integration using the average of the current and previous values times dt. The data will have just the time step number, so you'll have to know what you set the time step (dt) to in seconds. Jeff

 January 9, 2004, 01:18 Re: Time intergrate of mass flow #4 Jackie Guest   Posts: n/a Thank you very much Glenn and Jeff.

 Thread Tools 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 On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Attesz CFX 7 January 5, 2013 04:32 Prakash FLUENT 0 December 11, 2007 20:23 msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58 Pravir Kumar Rai FLUENT 0 February 19, 2003 15:03 Pravir Kumar Rai FLUENT 0 February 17, 2003 20:23

All times are GMT -4. The time now is 09:10.

 Contact Us - CFD Online - Top