000203572 001__ 203572
000203572 005__ 20181205220109.0
000203572 0247_ $$2doi$$a10.5075/epfl-thesis-6284
000203572 02470 $$2urn$$aurn:nbn:ch:bel-epfl-thesis6284-2
000203572 02471 $$2nebis$$a10279550
000203572 037__ $$aTHESIS
000203572 041__ $$aeng
000203572 088__ $$a6284
000203572 245__ $$aSimulation of Silt Erosion Using Particle-Based Methods
000203572 269__ $$a2014
000203572 260__ $$aLausanne$$bEPFL$$c2014
000203572 336__ $$aTheses
000203572 502__ $$aProf. D. Pioletti (président) ; Prof. F. Avellan (directeur) ; Dr F. Mazzouji,  Prof. J.-F. Molinari,  Dr N. Quinlan (rapporteurs)
000203572 520__ $$aIncreasing demand for clean sources of energy have forced electricity providers to paymore attention to their hydropower assets. Silt erosion is a destructive phenomenon that may occur in hydropower plants. The power plant subjected to silt erosion requires more repair and maintenance operations. In severe erosion conditions,machines can be shut down for several times in a working season therefore affecting total production. Hence,mitigation of silt erosion is desired by power plants owners. To this day, there are no accurate instrumentation to monitor silt erosion in hydropower facilities. Moreover, due to the complexity of the phenomena, analytical studies are unable to provide reliablemodels. Meanwhile, there are now studies employing numerical approaches to investigate this phenomena. However, to the best of the author’s knowledge, no erosion model exists in which all the interfering phases are modeled numerically. This work presents a new model for silt erosion in which the fluid flow, solid deformation, mass removal and silt motion are simulated. The fluid flow is assumed viscous and weakly compressible. The solid deformation is found from an elasto-plastic constitutive model with isotropic linear hardening. Silt particles are assumed rigid and spherical and their motions are driven by Newton’s second law. The contact force between silt and solid material is modeled according to theHertz contact theory. Fluid and solid equations are discretized using Finite Volume ParticleMethod (FVPM). The interaction between fluid-silt and fluid-solid is accomplished by boundary particles moving with silt or solid velocity. Applying the no-slip wall condition for fluid flow, hydrodynamic forces directly affect the silt or solid. FVPMis a particle-basedmethodwhich includesmany of the desirable features ofmesh-based finite volumemethods. FVPMuses particle interaction vectors to compute the conservative fluxes exchanged between particles. These vectors are equivalent to the intercell area vectors in themesh-based finite volumemethod. To compute the interaction vectors, either numerical or exact integration is applied. Numerical integration based on quadrature rules is approximate and costly, whereas the exactmethod employing circular top-hat kernel is precise and fast. To date, the exactmethod is developed only for 2-Dcomputations. In thiswork,we innovate a 3-D version of FVPM. Thismethod features rectangular top-hat kernels, a reasonable compromise between efficiency and accuracy. [...]
000203572 6531_ $$asilt erosion
000203572 6531_ $$aparticle-basedmethod
000203572 6531_ $$afinite volume particlemethod (FVPM)
000203572 6531_ $$ahigh performance computing
000203572 6531_ $$amassively parallel computers
000203572 6531_ $$aSPHEROS
000203572 700__ $$0243107$$aJahanbakhsh, Ebrahim$$g196478
000203572 720_2 $$0241012$$aAvellan, François$$edir.$$g104417
000203572 8564_ $$s27000836$$uhttps://infoscience.epfl.ch/record/203572/files/EPFL_TH6284.pdf$$yn/a$$zn/a
000203572 909C0 $$0252135$$pLMH$$xU10309
000203572 909CO $$ooai:infoscience.tind.io:203572$$pthesis-bn2018$$pDOI$$pSTI$$pthesis$$qDOI2
000203572 917Z8 $$x108898
000203572 917Z8 $$x108898
000203572 917Z8 $$x108898
000203572 917Z8 $$x108898
000203572 918__ $$aSTI$$cIGM$$dEDME
000203572 919__ $$aLMH
000203572 920__ $$a2014-11-28$$b2014
000203572 970__ $$a6284/THESES
000203572 973__ $$aEPFL$$sPUBLISHED
000203572 980__ $$aTHESIS