Problem with source cfx

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 March 6, 2013, 20:53 Problem with source cfx #1 Member   Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 96 Rep Power: 5 The problem below is informed: Expression resolves to invalid units ('kg m^-3 s^-1') in value set for parameter 'Total Source' in object '/FLOW:Flow Analysi1/DOMAIN:serpentina/BOUNDARYut serpentina/BOUNDARY SOURCE/SOURCES/EQUATION SOURCE:C2H3Cl mvc.mf'. Expected units: 'kg s^-1'. how could resolved this problem??

 March 6, 2013, 22:57 #2 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 566 Rep Power: 11 Um . . . divide by m^-3 . . . . really?

 March 6, 2013, 23:10 #3 Member   Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 96 Rep Power: 5 I did not, how exactly do I do this?

 March 7, 2013, 05:29 #4 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 566 Rep Power: 11 Your expression has the wrong units. You are giving it a concentration per second, and it is expecting a mass per second. Fix your expression so that it gives the expected units.

 March 7, 2013, 05:41 #5 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 barney=1[kg s^-1] fred=barney/1[m^3] Now fred is in kg m^-3 s^-1 But even better - Erik's suggestion is that this means the expression calculating it is probably wrong. If the units do not check out the numbers have no hope of being right so dividing by m^-3 is not going to fix the real error.

 March 7, 2013, 08:51 #6 Member   Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 96 Rep Power: 5 Problem i'm creating a subdomain...before a try ina a boundary...thanks a lot!!1

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