Regarding CFD Post, the example below shows three expressions defined in CFD Post. Notice how units are defined for each expression, but they can be mixed if desired. That takes you to the expression editor, as shown here: In CFX Pre, expressions are accessed by double clicking on Expressions in the tree. CFD Post, with relevant choices for each. The available options are different in CFX pre vs. There are many predefined values, including some common CFD constants such as pi, the universal gas constant, and Avogadro’s number. You can also use built-in functions such as sine, cosine, tangent and other trig functions, exponent, log, square root, absolute value, minimum, maximum, etc. So, what kind of things can you do in an expression? In addition to accessing simulation information and storing it as a variable, you can manipulate values using operators such as add, subtract, multiply, divide, and raise to a power. Expressions defined in CEL can be used in design point studies in ANSYS Workbench, either as input or output parameters. CEL can also be used to access and enhance results information. Virtually any quantity in CFX that requires a value input can make use of CEL, including boundary conditions and material properties. Most of the activity is enabled by right clicking. A handy editor is available to assist in the definition of the expressions. Therefore, CEL definitions contain units where appropriate.ĬEL is typically used in CFX-Pre and CFD-Post. One difference, though, is that while Mechanical APDL is dimensionless, CFX is not. If you are a user of APDL, ANSYS Parametric Design Language, what I have written above about CEL should look familiar. File Types Used and Produced by CFD-Post // 7.15.10. This link in to the ANSYS 14.5 Help system explains it: There are some things to be aware of regarding FLUENT In CFD Post.
#Cfx ansys code#
With CEL we can access and manipulate information without needing to recompile code or access separate routines besides the main CFX applications.Īlso note that since CEL can be used in CFD Post, it is useful for postprocessing FLUENT solutions in addition to CFX, since CFD Post is common to both CFX and FLUENT.
Through the use of CEL we can be more efficient in our CFD runs and better capture results that we need.
We have some general information on CFX available at this link.ĬFX Expression Language, or CEL, is the scripting language that allows us to define inputs as variables, capture outputs as variables, and perform operations on those variables.
It is relatively easy to use and can be run stand-alone or tightly integrated with other ANSYS products within ANSYS Workbench. CFX has been part of the ANSYS family of engineering tools since 2003. If you’re not familiar with CFX, it is one of the two CFD tools available from ANSYS, Inc., the other being Fluent. This week we are presenting an introduction to CFX Expression Language.
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