Kazem

Revision as of 16:22, 24 July 2013

Multifluid module

Introduction

Mold filling of an industrial specimen.

About this module

• Solves the Navier-Stokes equations for a multi-fluid system considering large jumps in density .
• Tractions are considered continuous at the interface and therefore no jump in viscosity is considered.
• Level Set method is used to determine the interface position at each step.
• Local pressure enrichmnet is considered at the cutted element to capture the discontinuous pressure gradient.

Technical descriptions

Fluid types

• Incompressible fluid

Constitutive laws

• Newtonian

Kinematic approaches

• Eulerian
  • With free surface (level set)

Solution strategy

• Monolithic
  • Residual based Newton Raphson strategy is exploited to treat nonlinearities.

Elements

3D: Linear tetrahedral elements (It works just in 3D)

• Element name: DPGVMS( Discontinuous Pressure Gradiant with Variational Multi Scale technique)

Boundary conditions

• Velocity boundary condition: Inlet of water
• Pressure boundary condition: Pressure can be imposed strongly or weakly...
• Wall boundary condition:
  • Slip boundary condition: If velocity is not assigned to a boundary it is automatically considered as Slip.

Initial conditions

• Zero of the Level set has to be assigned as the initial condition by assigning + and - Distance flag.

Turbulence models

All turbulance models inside KRATOS can be used:

• Smagorinsky-Lily
• Spalart-Allmaras

HPC

The code can be run in shared or distributed memory:

• OpenMP: The official version is written to work in OpenMP.
• MPI: It has been tested but is not provided for the official version.

Problem parameters

Others relevand aspects

• Volume correction is activated.

Contact people

Kazem Kamran: kazem@cimne.upc.edu