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Using execute command to ignore some equations during each time step

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Old   November 4, 2015, 16:19
Default Using execute command to ignore some equations during each time step
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Hi friends,

I'm searching for a command which we can use that to ignore some equations for several iterations in each time step.
For example for my simulation, in each time step I want to solve only energy equation for first 20 iterations and then add other equations to that and rest iterations progress with all of them.
As I know it's possible by adding a command in "execute command" tab
Could anybody share the command?
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