Comparative evaluation of two different 3D OpenFOAM modules in a dam-break test
Tutor / director / evaluatorGómez Valentín, Manuel
Document typeBachelor thesis
Rights accessOpen Access
The main objective of this work is to analyse the two different turbulence methodologies, LES and RANS, using three numerical OpenFOAM simulations based on the Finite Volume Method. Also, the non-hydrostatic effects produced by the highly curved surface are analysed. In order to assess the 3D model, two dam-break experiments are used to calibrate (Kleefsman et al., 2005) and validate (Fraccarollo and Toro, 1995) the model, respectively. LES methodology is simulated using Smagorinsky submodel while in RANS the RNG kepsilon is used. To simulate the water surface, the Volume of Fluid and the interFoam solver are used. A computer with 32 GB of RAM memory and Intel Core i7-6700k processor is used to simulate the experiments. The computational time to simulate the second experiment with 1 cm mesh is around 2 days. In conclusion both models simulate quite well the water height, whereas the pressure results are less precise. Even though, Smagorinsky model gets better results in the first experiment. In the second experiment, Smagorinsky model shows that it is able to follow the variability in time of the variables under study; however, there are parts in which the model underestimates the values while in others it overestimates the values. Regarding to the comparison, done in this experiment, between the pressure head and the water height, they are not equal when there is a highly curved water surface.