3D-PURLES - INCOMPRESSIBLE FLOW SIMULATIONS

3D-Purles - Incompressible flow simulations

Highlights 

• Extensive research in the area of turbulence and transition for incompressible flows
• The in-house incompressible flow solution code 3D-PURLES (3D parallel multi-block pressure-based finite volume NS code) is capable of handling both external and internal flows.
• 3D-PURLES is constantly  upgraded with state-of the art techniques to handle the complex flows with better accuracy
• 3D-PURLES extensively used for various hydrodynamic and low speed aerodynamic problems under different sponsored R & D projects
• The transition phenomenon in particular for MAV wings are captured using 3D-PURLES
• Large Eddy Simulations of flow past circular cylinder carried out using 3D-PURLES has captured most of the flow physics encountered in the different flow regimes.
• The in-house structured grid generation tool which on differential-algebraic hybrid procedure is extensively used for two-dimensional as well as simple three-dimensional geometries
• Commercial grid generation tool POINTWISE is also used to generate structured gird for complex geometry and unstructured grids
• The open source CFD tool OpenFOAM has been explored using both structured as well as unstructured grids
• Detached Eddy Simulation is the ongoing research
• Research Papers – 6 Journal, 41 Conference, 27 documents

Major features of the in-house code 3D-PURLES

• Multiblock Structured Boundary-Orthogonal Body-Fitted Curvilinear grids
• Cell centered with cartesian velocity components
• Time accurate Implicit  pressure based finite volume approach
• Second order accurate schemes for spatial and temporal discretisation
• SIMPLE  algorithm with momentum interpolation for cell centered variables
• Turbulence models : – k-e,  k-w,  v2f,  SST,  SA
• Transition models :-  k_T – k_L– ω and g – Re_θ SST
• Large Eddy Simulation – Smagorinsky and Dynamic sub-grid scale models
• Parallelised using domain decomposition methodology

Turbulence Modelling for  external steady flows

• Hydrodynamic applications : Submarine Sonar Dome, Torpedoes, Marine propellers, ship hulls with sonar dome
• DWR Radome Structures , Water tanks
• Airfoils, wings
• Aerostat balloons
• Mav wings and fuselage
• Impinging jet on a plate
• Prolate Spheroid at high Re

3D-PURLES simulations  of hydrodynamic problems using k-e turbulence model. These simulations were carried on NAL Flosolver Mk5 super computer .

3D-PURLES simulations using k-e turbulence model could the major features of the complex flow and is found to be in good agreement with IISc measurements

3D-PURLES used to study the performance MAV configurations and the aerodynamic data generated is in good agreement with NAL measurements

3D-PURLES could predict  the primary separation,  secondary separation and aerodynamic coefficients close to the measurement

Turbulence Modelling for  external unsteady flows

• Bluff bodies – Circular & Square cylinder
• Radome Structures
• Airfoil at high angles of attack
• Low Re airfoils
• Pitching airfoils
• Airfoils with leading edge droop

Transition Modelling for external flows

• Zero and non-zero Flat plate test cases
• Low Re airfoils used in MAVS
• 300 and 150mm MAV wings
• Prolate Spheroid at low Re

Large Eddy Simulation

Steady and Unsteady internal flow

• Chanel flows
• S-Ducts with different bent angles and Aspect Ratio
• Unsteady flow of bluff body in channel
• T- and Y- junctions
• Cooling System of Airborne Radar