In a steady state coal combustion calculation it is sometimes useful to be able to set a different Physical Timescale for the mass fractions involved in NOx reactions. In CFX-Pre it is only possible to set a single Physical Timescale value for all mass fraction components.
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The Physical Timescale for individual mass fraction components, in a definition file named `defilename.def`, can be changed using the following method. 1: From the CFX launcher select tools/command line. 2: In the resulting command tool type cfx5cmds `read `def defilename.def `text defilename.ccl 3: Use a text editor to edit the file `filename.def` and add the following lines under the `SOLVER CONTROL` section. EQUATION CLASS: mf CONVERGENCE CONTROL: Physical Timescale = 0.0001 [s] Timescale Control = Physical Timescale END END EQUATION: HCN.mf CONVERGENCE CONTROL: Physical Timescale = 0.003 [s] Timescale Control = Physical Timescale END END EQUATION: NO.mf CONVERGENCE CONTROL: Physical Timescale = 0.003 [s] Timescale Control = Physical Timescale END END 4: In the command tool type cfx5cmds `write `def defilename.def `text defilename.ccl |
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