Mechanical Engineering MVGRComputational Fluid Dynamics1Introduction to Computational Fluid Dynamics (CFD)Md Yousuf Ali
Mechanical Engineering MVGRComputational Fluid Dynamics2Outline1. What, why and where of CFD?2. Modeling3. Numerical methods4. Types of CFD codes5. CFD Educational Interface6. CFD Process7. Example of CFD Process8. CFD Labs
Mechanical Engineering MVGRComputational Fluid Dynamics3Where is CFD used?•Where is CFD used?•Aerospace•Automotive•Biomedical•Chemical Processing•HVAC•Hydraulics•Marine•Oil & Gas•Power Generation•SportsF18 Store Separation Temperature and natural convection currents in the eye following laser heating. AerospaceAutomotiveBiomedical
Mechanical Engineering MVGRComputational Fluid Dynamics4Where is CFD used?•Where is CFD used?•Aerospacee•Automotive•Biomedical•Chemical Processing•HVAC•Hydraulics•Marine•Oil & Gas•Power Generation•SportsPolymerization reactor vessel - prediction of flow separation and residence time effects. Streamlines for workstation ventilationHVACChemical ProcessingHydraulics
Mechanical Engineering MVGRComputational Fluid Dynamics5Where is CFD used?•Where is CFD used?•Aerospace•Automotive•Biomedical•Chemical Processing•HVAC•Hydraulics•Marine•Oil & Gas•Power Generation•SportsFlow of lubricating mud over drill bitFlow around cooling towersMarine (movie)Oil & GasSportsPower Generation
Mechanical Engineering MVGRComputational Fluid Dynamics6Modeling•Modeling is the mathematical physics problem formulation in terms of a continuous initial boundary value problem (IBVP)•IBVP is in the form of Partial Differential Equations (PDEs) with appropriate boundary conditions and initial conditions.•Modeling includes:1. Geometry and domain2. Coordinates3. Governing equations4. Flow conditions5. Initial and boundary conditions6. Selection of models for different applications
Mechanical Engineering MVGRComputational Fluid Dynamics7Modeling (geometry and domain)•Simple geometries can be easily created by few geometric parameters (e.g. circular pipe)•Complex geometries must be created by the partial differential equations or importing the database of the geometry(e.g. airfoil) into commercial software•Domain: size and shape•Typical approaches •Geometry approximation•CAD/CAE integration: use of industry standards such as Parasolid, ACIS, STEP, or IGES, etc.•The three coordinates: Cartesian system (x,y,z), cylindrical system (r, θ, z), and spherical system(r, θ, Φ) should be appropriately chosen for a better resolution of the geometry (e.g. cylindrical for circular pipe).