BEST PRACTICE GUIDELINE FOR THE CFD SIMULATION OF FLOWS IN by Jörg Franke, Antti Hellsten, Heinke Schlünzen, Bertrand

By Jörg Franke, Antti Hellsten, Heinke Schlünzen, Bertrand Carissimo

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The advantages of the method are the following: • • • As a post-processing tool it can be applied with every discretisation method (Finite Difference, Finite Volume and Finite Element). No intrusion into the code is necessary. The global error or estimates of this error can be calculated for every quantity. 2. Code verification As stated in the beginning code verification is used to analyse whether the conceptual model is correctly implemented in the computerised model or CFD code. , 2004). If the numerical method is consistent then the basic partial differential equations are recovered from the discrete equations in case of vanishing grid and time step size.

123-160, 1997. Roache, P. , Verification and Validation in Computational Science and Engineering, Hermosa Publishers, New Mexico, 1998. Roache, P. , Code verification by the method of manufactured solutions, ASME Journal of Fluids Engineering, Vol. 124, pp. 4-10, 2002. Roache, P. , Criticisms of the “Correction Factor” Verification Method, ASME Journal of Fluids Engineering, Vol. 125, pp. 732-733, 2003. Roy, C. , Review of code and solution verification procedures for computational simulation. Journal of Computational Physics, Vol.

These solutions do of course not fulfil the basic conservation equations but lead to additional source terms when inserted in the basic equations. Thus with MMS not the original system of equations is solved but a modified system of equations. However, the additional terms are known and can be implemented into the code in the exact analytical form. The corresponding initial and boundary conditions are also obtained from the prescribed analytical solutions. When the original code is 37 run with these extensions then results of the simulation must approach the prescribed analytical solutions at a rate with the formal order of accuracy when the grid or the time step are refined.

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