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- - **Equation transformation and extension**
(*https://www.cfd-online.com/Forums/openfoam-programming-development/106162-equation-transformation-extension.html*)

Equation transformation and extension1 Attachment(s)
Hi all,
just a question to all good OpenFOAM people. I have a paper and there is a extension of the momentum, enthalpy, continuity ... equations to calculate atmosphere things and its based on the buoyant approximation. Therefor you have to transform the z coordinate to tilde z and for that you get tilde w instead of w. (look to the attached pdf). The question is: Is it complicated to implement such a transformation in OpenFOAM? And how many time do I have to spend in it? I am familiar with OpenFOAM code and programmed a few extensions to basic solvers etc. but never did a transformation. In all equations there are additional source terms but that is not a problem to add to the buoyant solver. Its just the transofmration and how do I have to fix that problem. Thanks for reading and I am looking forward for answers :) Tobi |

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