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Workflow in testing & using a model
Simulator > Simulator module > Workflow in testing & using a model
 On opening a Scenario in Simulator

On opening a Scenario in Simulator the main chart will appear. This contains:

 Doing spot checks before running a model for the first time

Check that the experimental data and imposed profiles for the Scenario appear on the chart. as you intended. You can use the y-axis controls to re-scale the chart and rollover on points to check their values.

 Benefits of manual fitting before using automated fitting

One of the main problems inherent with automated parameter fitting is that the algorithm can sometimes find what is called a 'local minimum'. A local minimum can give the wrong values of fitted parameters and it will appear to new users as though 'fitting doesn't work'.

As a user you want to find the 'global minimum', i.e. the actual kinetic parameters for your process. To give yourself the best chance of being successful, it is recommended (and often essential) that a degree of manual fitting is undertaken in Simulator using the Reactions and Parameters windows. This will provide the fitting algorithm better initial estimates of the parameters you want fitted. More on manual fitting.

 Parameter sensitivity tests

In process modeling you are often required to make estimates for parameter values. Testing whether the result of a simulation is strongly dependent, weakly dependent or even independent of a parameter's value can be useful in determining the sensitivity of the process and the accuracy to which a parameter's value needs to be known to give reliable results. You can do quick sensitivity tests in Simulator using Set Reactions and Set Parameters. Useful background on the importance of sensitivity analysis is given in the following publication: Good Practice Guidelines, "The Use of Computers by Chemical Engineers", IChemE Computer Aided Process Engineering (CAPE) Subject Group, UK, July 1999.