# mass flow unit change

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

 July 22, 2010, 02:09 mass flow unit change #1 Member   jaikrishna Join Date: Mar 2009 Location: chennai Posts: 56 Rep Power: 10 Sponsored Links I want to view massflow rate in the unit of kg/millisec in CFD-post. how can i do it? and In pre i've given mass flow rate in kg/sec and i do a transient simulation for less than 1 second. now i want to know the total mass flow for the particular time period.

July 22, 2010, 03:49
Just Units...
#2
Senior Member

Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 448
Rep Power: 13
Quote:
 Originally Posted by jai I want to view massflow rate in the unit of kg/millisec in CFD-post. how can i do it? and In pre i've given mass flow rate in kg/sec and i do a transient simulation for less than 1 second. now i want to know the total mass flow for the particular time period.
i am not quite sure if got you right, but total mass flow= rate*time so your given mass flow rate from pre is actually what you´re looking for.
Rate is rate, nomatter how long you calculate it. Just divide by 1000 and you end up with you kg/millisec.

neewbie

 July 22, 2010, 04:04 Re #3 Member   jaikrishna Join Date: Mar 2009 Location: chennai Posts: 56 Rep Power: 10 how can i change the unit showing in post? even through custom mode i can change to kg/sec, kg/hr and kg/min but i can't able to change into kg/millisec..

 July 22, 2010, 04:22 #4 Senior Member   Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 448 Rep Power: 13 hi, 1.create an expression like mymf=Fluid.Mass Flow 2.create an Variable mymf which is the expression mymf AND here comes the trick 3.make a new variable which is a copy of mymf(variable) let´s say MassFlow then rightclick over MassFlow --> edit in Command Editor and add a field like kg ms^-1 at the field User Unit. I guess you could just do the second step (Frozen Copy of a Variable) since you probably already have something like Fluid.Mass Flow neewbie

July 22, 2010, 07:16
Re
#5
Member

jaikrishna
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 10
Pls show me the screenshot of 3rd step if possible because i've not seen any user unit line there...
Pls ref the attached pic.
Attached Images
 unit try.jpg (42.1 KB, 6 views)

July 22, 2010, 07:25
#6
Senior Member

Matthias Voß
Join Date: Mar 2009
Location: Berlin, Germany
Posts: 448
Rep Power: 13
i don´t know what your expression mf is like. anyways.
but i actually discovered that cfx will change the units back to kg/s, so you will have to change to not showing the units in the legend and than insert a textbox telling the corresponding unit (e.g. [kg/ms]).
for my way was working,... so im not sure why it isn´t the case for you.
neewbie
Attached Images
 Unbenannt.JPG (48.0 KB, 6 views)

 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 jallison FLUENT 1 May 16, 2011 16:22 NewMY FLUENT 4 November 26, 2009 03:26 michael FLUENT 4 February 21, 2005 04:48 Saturn FLUENT 0 December 10, 2004 05:18 Atit Koonsrisuk CFX 2 October 5, 2003 04:47