Computational Fluid Dynamics

This video is one of a 10 part series. Visit our channel's playlist to watch the full set. If you would like more information about Opgrade or Nate Barber visit www.opgrade.com. Narrator: Nate Barber Video slides: COMPUTATIONAL FLUID DYNAMICS -What is Computational Fluid Dynamics (CFD)? *Detailed fluid flow modeling inside a limited domain using numerical methods *Laminar, turbulent, compressible, incompressible, single-phase, multi-phase, subsonic, and supersonic flows can all be analyzed *The iterative process: -Converge pressures, temperatures, flows and stresses - Move forward in time -Repeat * Time steps can range from 1x10-3 s to 1x10-6 s - Why perform CFD studies? * Accurately predict fluid flows in a system without physically building and testing that system - Prevent problems from happening - Explain why problems occurred - Predict how prototypes will perform * Impress others -Often CFD isn’t really needed, but it looks cool - How to perform a CFD study * Collect and document assumptions in a Study Basis -Collaborative document to gain team agreement * Define geometry (create 3D model) -Inlet and outlet locations are often very important -CAD experience is helpful here * Discretize volumes (apply mesh to the 3D model) -Smaller cells allow for greater detail -Smaller cells mean slower model, more calculations -How to perform a CFD study (cont’) * Set boundary conditions - Velocity inlet, fixed pressure outlet * Select turbulence equations * Start running model according to Study Basis - Does the model need to change to better reflect reality? - Do assumptions need to change to better reflect reality? * Wait days and days and days and days * Post-processing - Create video by stringing snapshots together * Collect and document results in a Final Report - Available software *ANSYS -Fluent -CFX * Dassault Systemes -Abaqus Unified FEA/CFD -SOLIDWORKS Flow Simulation * AUTODESK -Simulation CFD