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Old   July 22, 2010, 02:09
Default mass flow unit change
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jai
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jaikrishna
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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.
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Old   July 22, 2010, 03:49
Default Just Units...
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Matthias Voß
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Quote:
Originally Posted by jai View Post
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.

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Old   July 22, 2010, 04:04
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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..
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Old   July 22, 2010, 04:22
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Matthias Voß
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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

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Old   July 22, 2010, 07:16
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jai
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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.
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Old   July 22, 2010, 07:25
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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.
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