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CEL-CFXExpressionLanguageAllowstheusertocreateequations(canbefunctionsofsolution/systemvariables)thatcanbeusedinCFX-PreandCFD-PostExample:Thesyntaxrulesarethesameasthoseforconventionalarithmetic.Operatorsarewrittenas:+(addition)-(subtraction)*(multiplication)/(division)^(exponentiation)Variablesandexpressionsarecasesensitive(example:tvs.T)Expressionsmustbedimensionallyconsistentforadditionandsubtractionoperations(example:1.0[mm]+0.45[yds]isOK)YoucannotaddvalueswithinconsistentdimensionsFractionalanddecimalpowersareallowed(example:a^(1/2)+1.0^0.5)Unitsofexpressionsarenotdeclared–theyaretheresultofunitsintheexpression(example:a[kgm^-3]*b[ms^-1]hasunitsof[kgm^-2s^-1]SomeconstantsarealsoavailableinCELforuseinexpressions:eConstant:2.7182818gAccelerationduetogravity:9.806[ms^-2]piConstant:3.1415927RUniversalGasConstant:8314.5[m^2s^-2K^-1]NumericalfunctionsandoperatorsarealsoavailableinCELRight-clickwhencreatingexpressionsforacompletelistCustomfunctionswithUserFortrancanalsobecreatedxDirection1inReferenceCoordinateFrameyDirection2inReferenceCoordinateFramezDirection3inReferenceCoordinateFramerRadialspatiallocation,r=(x^2+y^2)^0.5thetaAngle,arctan(y/x)tTimeuVelocityinthexcoordinatedirectionvVelocityintheycoordinatedirectionwVelocityinthezcoordinatedirectionp(absolute)PressurekeTurbulentkineticenergyedTurbulenteddydissipationTTemperaturesstrnrShearstrainratedensityDensityrNoDimNon-dimensionalradius(rotatingframeonly)viscosityDynamicViscosityCpSpecificHeatCapacityatConstantPressurecondThermalConductivityAVnameAdditionalVariablenamemfMassFractionAlternatively,anexpressioncanbeentereddirectlyintoafieldUsingan“if”FunctionSetinlettemperatureto300Kforthefirst19iterationsthenraiseitto320Kafter20iterationsYoucanalsodefineyourown1-Dlinear,or3-DcloudofpointsinterpolationfunctionsExample:HavingthetimestepchangewithiterationnumberasshownhereIntegratedquantitiescanbeusedinex
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