About "Generate New Turbulence Model Interface"

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In the User's Guide doc, the "Generate New Turbulence Model Interface" is designed to "create a new turbulent flow interface based on the current laminar or turbulent flow interface." And "Note that the parameters and expressions in text fields in all the features, except for Initial Values and the Name column in Global Equation, get exactly the same expressions as in the original model. " What is the difference if someone adds a new turbulent interface and inherent the old solution in the study node? What is the purpose for this interface? If I want to add an source term in the k-epsilon equation, what should be done?


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