# Kinematic Diffusivity error

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 March 17, 2012, 04:37 Kinematic Diffusivity error #1 Member   jack Join Date: Jul 2011 Posts: 52 Rep Power: 6 Hi everybody These days I have been studying a case of electric arc. I set an additional Variable name EPOT whose equation is diffusive transport equation.And I set the kinematic diffusivity as "Electric Conductivity/density*factorPhi".Electric Conductivity is also an additional Variable whose equation is algebraic equation.And its value I have set as constant.But when I run the case I met the following error: Error processing expression 'Kinematic Diffusivity'. The expression is invalid because: Electric Conductivity is not available for use in this term Error processing expression: Kinematic Diffusivity = Electric Conductivity/density*factorPhi What is the problem?How can I solve it?Thank you very much! lg88

 March 17, 2012, 06:12 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 Electrical conductivity does not appear on the list of available variables. I would set the electrical conductivity to equal a CEL expression, then you can use this CEL expression in calculations like this one.

 March 18, 2012, 10:07 #3 Member   jack Join Date: Jul 2011 Posts: 52 Rep Power: 6 Thanks to Glenn.I have set the electrical conductivity to equal a CEL expression.And the error has been solved.But I met a new problem when I run the case. +--------------------------------------------------------------------+ | Reference Pressure Information | +--------------------------------------------------------------------+ Domain Group: corus Pressure has not been set at any boundary conditions. The pressure will be set to 0.00000E+00 at the following location: Domain : corus Node : 1 (equation 1) Coordinates : ( 1.33974E-09, 0.00000E+00,-5.00000E-02). Details of error:- ---------------- Error detected by routine MAKDIR CDRNAM = EPOT_FL1 /GRADIENT CRESLT = ILEG Current Directory : /FLOW/ALGORITHM/ZN1/SYSTEM/VARIABLES what does it mean?How can I solve it?Thank you very much! lg88

 March 18, 2012, 17:52 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 This looks like two independant problems. The first one is you have not set any pressure level, so it guessed one. You should define a pressure level in your simulation somehow - either a pressure inlet or outlet, initial condition or something. The second problem is regarding a gradient calculation of electrical potential. Not sure about this one, I would fix the first problem and see if this persists. But it probably is unrelated to the pressure level problem.

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