![]() Set “u” to “Velocity Field” Note: for Turbulent flows (typical for room dispersion) you must select “Turbulent dispersion” in the “Drag Force” section.COMSOL 4.2 Tutorial COMSOL Multiphysics (formerly FEMLAB) is a finite element analysis, solver and Simulation software / FEA engineering applications, Software package especially coupled for various physics and phenomena, or multiphysics.Rt Click on “Particle Tracing for Fluid Flow”.Change to “Specify density & diameter”.Open “Particle Tracing for Fluid Flow”.Choose “Time Dependant” Note: You need an additional study since particle tracing is transient whereas the fluid flow was stationary.Choose “Fluid Flow” > “Particle Tracing for Fluid Flow”.Change iterations from 25 to 50 Note: This controls max number of Newton iterations before giving up.Give the Nonlinear Solver more Iterations Build Note: This is way too coarse for accurate flow.Choose the end of the hallway near the door.Build All, Zoom Extents Or you can build it from scratch (instructions at end of presentation).Choose “ContaminationPlume_GEOM_SEQUENCE”.Navigate to proper file location (probably on CD).Select “Fluid Flow” > “Single Phase Flow” > “Laminar Flow”.To Get More Information … Attend a Free Seminar Ĭapture the ConceptTM Addendum Step-by-Step Instructions Transmission Probability 10 micron Particles.Solve with Transient Finally: Results Statistics.Mesh & Solve DONE: Add Particle Tracing.Review Air Velocity Setup and Solve AirFlow Calculate Transmission Probability 10 micron Particles.Tutorial Roadmap Air Velocity DONE: Setup and Solve AirFlow DONE: Add Particle Tracing Finally: Results Statistics Grid Based (Release from Grid) Distributed over Domain Mesh Based Particle Release (Inlet Node) Refinement factor = 1 Refinement factor = 2ĭensity Based Particle Release (Inlet Node) Expression = 1 Expression = 1/(x2+y2) Particle Release Options Release on Boundary ![]() Generates random-normal forces on particle to include forces from turbulent eddies.While it’s Solving … What about Turbulence? Requires either the CFD or Heat Transfer or Chem Rx Eng’g Module 2-Step Solution Finally: Results Statistics 10 micron Particles.Tutorial Roadmap Air Velocity DONE: Setup and Solve AirFlow Next: Add Particle Tracing While it’s Solving … What about Turbulence? Requires either the CFD or Heat Transfer or Chem Rx Engr’g Module Everything you do is recorded in the Model Builder.Will show at conclusion of problem how to solve with turbulence.Turbulence introduces more variables to calculate For this example we will ignore this(It’s a classroom example!).Turbulence requires a much denser mesh.Checking the Reynolds number – This should be turbulent flow The Problem Size gets much bigger. ![]() V = 0.15 m/s P=0 P=0 Office Door Hallway Hallway P = 0 V=0.15ĭisclaimer! This Flow is Actually Turbulent
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