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Chapter11CFXExpressionLanguage(CEL)CEL-CFXExpressionLanguage
Allowstheusertocreateequations(canbefunctionsofsolution/systemvariables)thatcanbeusedinCFX-PreandCFD-Post

Example:

Thesyntaxrulesarethesameasthoseforconventionalarithmetic.Operatorsarewrittenas:
+(addition)	-(subtraction)	*(multiplication)	
/(division)		^(exponentiation)

Variablesandexpressionsarecasesensitive(example:tvs.T)

Expressionsmustbedimensionallyconsistentforadditionandsubtractionoperations(example:1.0[mm]+0.45[yds]isOK)
Youcannotaddvalueswithinconsistentdimensions

Fractionalanddecimalpowersareallowed(example:a^(1/2)+1.0^0.5)

Unitsofexpressionsarenotdeclared–theyaretheresultofunitsintheexpression(example:a[kgm^-3]*b[ms^-1]hasunitsof[kgm^-2s^-1]

SomeconstantsarealsoavailableinCELforuseinexpressions:
eConstant:2.7182818
gAccelerationduetogravity:9.806[ms^-2]
piConstant:3.1415927
RUniversalGasConstant:8314.5[m^2s^-2K^-1]
NumericalfunctionsandoperatorsarealsoavailableinCEL
Right-clickwhencreatingexpressionsforacompletelist
CustomfunctionswithUserFortrancanalsobecreatedx		Direction1inReferenceCoordinateFrame	
y		Direction2inReferenceCoordinateFrame	
z		Direction3inReferenceCoordinateFrame	
r		Radialspatiallocation,r=(x^2+y^2)^0.5	
theta		Angle,arctan(y/x)	
t		Time	
u		Velocityinthexcoordinatedirection	
v		Velocityintheycoordinatedirection	
w		Velocityinthezcoordinatedirection	
p		(absolute)Pressure	
ke		Turbulentkineticenergy	
ed		Turbulenteddydissipation	
T		Temperature	
sstrnr		Shearstrainrate	
density		Density	
rNoDim		Non-dimensionalradius(rotatingframeonly)	
viscosity		DynamicViscosity	
Cp		SpecificHeatCapacityatConstantPressure	
cond		ThermalConductivity	
AVname		AdditionalVariablename	
mf		MassFraction	
whereistheshearstrainrateAlternatively,anexpressioncanbeentereddirectlyintoafieldUsingan“if”Function
Setinlettemperatureto300Kforthefirst19iterationsthenraiseitto320Kafter20iterationsYoucanalsodefineyourown1-Dlinear,or3-DcloudofpointsinterpolationfunctionsExample:Havingthetimestepchange
w