SAM
https://sam.ensam.eu:443
The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sat, 02 Mar 2024 07:11:58 GMT2024-03-02T07:11:58ZA very accurate Arbitrary Lagrangian–Eulerian meshless method for Computational Aeroacoustics
http://hdl.handle.net/10985/17782
A very accurate Arbitrary Lagrangian–Eulerian meshless method for Computational Aeroacoustics
RAMÍREZ, Luis; NOGUEIRA, Xesús; KHELLADI, Sofiane; KRIMI, Abdelkader; COLOMINAS, Ignasi
In this work, we propose a new meshless approach based on a Galerkin discretization of a set of conservation equations on an Arbitrary Lagrangian–Eulerian framework. In particular, we solve the Linearized Euler Equations, using Moving Least Squares as weight functions in the Galerkin discretization. Riemann solvers are introduced in the formulation for the discretization of the convective fluxes. Differently from a purely Lagrangian approach, as it is usual in SPH, the present method is able to work in both Eulerian and Lagrangian configurations, which allows using all the advantages of the Lagrangian approaches in the context of Computational Aeroacoustics.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/177822018-01-01T00:00:00ZRAMÍREZ, LuisNOGUEIRA, XesúsKHELLADI, SofianeKRIMI, AbdelkaderCOLOMINAS, IgnasiIn this work, we propose a new meshless approach based on a Galerkin discretization of a set of conservation equations on an Arbitrary Lagrangian–Eulerian framework. In particular, we solve the Linearized Euler Equations, using Moving Least Squares as weight functions in the Galerkin discretization. Riemann solvers are introduced in the formulation for the discretization of the convective fluxes. Differently from a purely Lagrangian approach, as it is usual in SPH, the present method is able to work in both Eulerian and Lagrangian configurations, which allows using all the advantages of the Lagrangian approaches in the context of Computational Aeroacoustics.Smoothed Particle Hydrodynamics: A consistent model for interfacial multiphase fluid flow simulations
http://hdl.handle.net/10985/17780
Smoothed Particle Hydrodynamics: A consistent model for interfacial multiphase fluid flow simulations
KRIMI, Abdelkader; REZOUG, Mehdi; KHELLADI, Sofiane; NOGUEIRA, Xesús; RAMÍREZ, Luis; DELIGANT, Michael
In this work, a consistent Smoothed Particle Hydrodynamics (SPH) model to deal with interfacial multiphase fluid flows simulation is proposed. A modification to the Continuum Stress Surface formulation (CSS) [1] to enhance the stability near the fluid interface is developed in the framework of the SPH method. A non-conservative first-order consistency operator is used to compute the divergence of stress surface tensor. This formulation benefits of all the advantages of the one proposed by Adami et al. [2] and, in addition, it can be applied to more than two phases fluid flow simulations. Moreover, the generalized wall boundary conditions [3] are modified in order to be well adapted to multiphase fluid flows with different density and viscosity. In order to allow the application of this technique to wall-bounded multiphase flows, a modification of generalized wall boundary conditions is presented here for using the SPH method. In this work we also present a particle redistribution strategy as an extension of the damping technique presented in [3] to smooth the initial transient phase of gravitational multiphase fluid flow simulations. Several computational tests are investigated to show the accuracy, convergence and applicability of the proposed SPH interfacial multiphase model.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/177802018-01-01T00:00:00ZKRIMI, AbdelkaderREZOUG, MehdiKHELLADI, SofianeNOGUEIRA, XesúsRAMÍREZ, LuisDELIGANT, MichaelIn this work, a consistent Smoothed Particle Hydrodynamics (SPH) model to deal with interfacial multiphase fluid flows simulation is proposed. A modification to the Continuum Stress Surface formulation (CSS) [1] to enhance the stability near the fluid interface is developed in the framework of the SPH method. A non-conservative first-order consistency operator is used to compute the divergence of stress surface tensor. This formulation benefits of all the advantages of the one proposed by Adami et al. [2] and, in addition, it can be applied to more than two phases fluid flow simulations. Moreover, the generalized wall boundary conditions [3] are modified in order to be well adapted to multiphase fluid flows with different density and viscosity. In order to allow the application of this technique to wall-bounded multiphase flows, a modification of generalized wall boundary conditions is presented here for using the SPH method. In this work we also present a particle redistribution strategy as an extension of the damping technique presented in [3] to smooth the initial transient phase of gravitational multiphase fluid flow simulations. Several computational tests are investigated to show the accuracy, convergence and applicability of the proposed SPH interfacial multiphase model.Multiphase smoothed particle hydrodynamics approach for modeling soil–water interactions
http://hdl.handle.net/10985/17779
Multiphase smoothed particle hydrodynamics approach for modeling soil–water interactions
KRIMI, Abdelkader; KHELLADI, Sofiane; NOGUEIRA, Xesús; ATA, Riadh; REZOUG, Mehdi; DELIGANT, Michael
In this work, a weakly compressible smoothed particle hydrodynamics (WCSPH) multiphase model is developed. The model is able to deal with soil-water interactions coupled in a strong and natural form. A Regularized Bingham Plastic constitutive law including a pressure-dependent Mohr-Coulomb yield criterion (RBPMC-αμ) is proposed to model fluids, soils and their interaction. Since the proposed rheology model is pressure-sensitive, we propose a multiphase diffusive term to reduce the spurious pressure resulting from the weakly compressible flow hypothesis. Several numerical benchmarks are investigated to assess the robustness and accuracy of the proposed multiphase SPH model.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/177792018-01-01T00:00:00ZKRIMI, AbdelkaderKHELLADI, SofianeNOGUEIRA, XesúsATA, RiadhREZOUG, MehdiDELIGANT, MichaelIn this work, a weakly compressible smoothed particle hydrodynamics (WCSPH) multiphase model is developed. The model is able to deal with soil-water interactions coupled in a strong and natural form. A Regularized Bingham Plastic constitutive law including a pressure-dependent Mohr-Coulomb yield criterion (RBPMC-αμ) is proposed to model fluids, soils and their interaction. Since the proposed rheology model is pressure-sensitive, we propose a multiphase diffusive term to reduce the spurious pressure resulting from the weakly compressible flow hypothesis. Several numerical benchmarks are investigated to assess the robustness and accuracy of the proposed multiphase SPH model.