ANSYSInc.StrategyandDirections.pptVIP

5. CFD Enhancements CFD Enhancements 5.1 ALE (Arbitrary Lagrangian Eulerian) Formulation The fluid mesh may now have prescribed movement 5.2 Surface Tension Effects 2D - Quadrilateral elements 5.3 Radiation in Flotran 5.4 Additional Algebraic Solver (BiCGStab) 5.5 Tabular Boundary Conditions 5.6 Interpolation of results onto a different mesh Refine the mesh and keep going 5.7 FSSOLV Macro Steady State Fluid Structure Interaction (FSI) 5.8 AUX3 - Results File Editor 5.1 ALE Formulation CFD Enhancements CFD EnhancementsALE Formulation ALE - Arbitrary Lagrangian Eulerian formulation for CFD analyses Typical ANSYS Applications moving walls, solids moving through fluids ANSYS 5.7 Target Rigid body FSI for MEMS devices( squeeze film damping, torsional mirrors) Extract damping/spring forces on moving body for reduced order modeling Interpretation and manipulation of FLOTRAN results data CFD Enhancements… ALE Formulation ALE allows for deforming/moving fluid domains Nodes are allowed to move in space to accommodate moving bodies User specifies displacements velocities time history for moving body and turns ALE on (FLDA,SOLU,ALE,T) Mesh morphing is based on constrained Laplacian smoothing CFD Enhancements… ALE Formulation Example: squeeze film CFD Enhancements… ALE Formulation Example: torsional oscillation CFD Enhancements… ALE Formulation Example: Comb drive problem - MEMS application CFD Enhancements… ALE Formulation Limitations in ANSYS 5.7: Incompressible flows and adiabatic compressible flows Cartesian XY and axisymmetric in 2D Cartesian XYZ in 3D Small mesh deformations Applied motion to additional lines enables larger motions 3D mesh morphing limited to tets or hex/wedge combination Free surface can be used via ALE-VOF combination capability CFD Enhancements… ALE Formulation Constraining the motion of nodes CFD Enhancements… ALE Formulation Squeeze film problem - circular plate CFD Enhancements… ALE Formulation Squeeze film problem (contd) A