Example on using CEL Langduge to Code an Equation
You will encounter such programing case when you get to the data analysis stage. As an example finding the Mach number at a point, finding the speed of sound at a point, Cavition occurance. Some thermodynamic and aerothermodynamic equations.
knowing what the expressions are
CFX Command Langudge Data Base
Functions and Statistical Tools Table
The following table shows the provided functions that come with ANSYS data analysis packedge.
ANSYS CFX Parameter application
This language is important it is called CFX CEL expression language. For certain applications the use of this language is essential such as for pumps where variable inflow conditions occur the same as for a combustion chamber with a cycle occurring for inflow and outflow, also for the case of applying an ignition source through linking the ignition sequence depending on time step or number of iteration. You can also control the outflow of a jet nozzle through assigning a. Assigning a velocity, temperature and concentration profile to the different inflow and outflow boundaries. Sometimes you might need several resonators to generate pulses near a surface. That requires knowing how to specify the location of the resonator in the domain and the timing of its pulses; these pulses are given a step function with relation to time.
Examples on using CEL langudge
That is through coding an a specific equation that is used for data analysis such as the one relating to studying turbine stage study in relation to efficiency and other flow parameters. That is done through averaging some flow properties at certain boundary and calculating the area or volume for a certain surface or control volume. This can also help in calculating concentration change for a specific volume in relation to time. Saving data at a specific point of the domain can be helpful throughout a simulation process in relation to time.
This can also help in applying equations for a changing porosity with time, also for a changing permeability for the study of porous media. Also the concentration of species production in relation of time and elevation can be done. Alternating different species injection stage into a mixing chamber by controlling the fluxes at different inflow boundaries in relation to time.
The best source of info is the following powerpoint presentation which is avaliable online:
The link provided below has initial material to get the researcher started.
The following web link provides some hints on how to implement the CFX expression languadge.
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