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May 3, 2006 Multiphase flows in Fluent using Volume of Fluid Willem van Engen
May 3, 2006 Volume of Fluid interacting, non-penetrating phases extra computation variable: volume fraction
May 3, 2006 Multiphase workflow Enable multiphase model Define materials Set initial phase – Areas from mesh – Marking rectangular/circular areas – Using custom field function
May 3, 2006 Multiphase post-processing Contours of volume fraction Phase-specific velocity vectors Reporting flux/force/flow rate for phase
May 3, 2006 Multiphase example
May 3, 2006 Automation in Fluent & Gambit with journals and scheme Willem van Engen
May 3, 2006 Automation facilities Journals (Gambit&Fluent) record, replay & edit Scheme programs (Gambit) full programming language
May 3, 2006 Gambit journals Just a list of commands from GUI Variables ($a=1) and statements Automatically saved (*.jou) Easily saved/run from GUI/command-line
May 3, 2006 just a simple square box of 1x1 meters Gambit journals – an example (1) (0,0)(1,0) (1,1)(0,1)
May 3, 2006 Gambit journals – an example (2) / Declare variables $gridsize = 0.01 / Create geometry vertex create coordinates 0 0 0 vertex create coordinates 1 0 0 vertex create coordinates 1 1 0 vertex create coordinates 0 1 0 edge create straight \ "vert.1" "vert.4" \ "vert.3" "vert.2" edge create straight \ "vert.2" "vert.1" face create wireframe \ “edge.1" "edge.2" \ "edge.3" "edge.4" real / Create mesh face mesh "face.1" map size $gridsize / Specify boundary conditions physics create "bottom" btype "WALL" \ edge "edge.4" physics create "sides" btype "WALL" \ edge "edge.1" "edge.3" physics create "top" btype "WALL" \ edge "edge.2" / Export mesh! export fluent5 "output.msh" nozval
May 3, 2006 Fluent journals Save chain of actions for exact replay Gets ugly soon Unsuitable for more general use Easily created/run from GUI/command- line
May 3, 2006 Fluent scheme programming Scheme (lisp) programming language Access to both GUI and text commands Hard to learn, sparse documentation Possible to hook into GUI
May 3, 2006 Fluent scheme programming - uses Set window title based on options Setup a new simulation for a mesh with one command Create a movie with overlay plots
May 3, 2006 Fluent scheme programming - example ; This is a comment. I love comments. (define timestep 0.01) (define iterations (/ 60 timestep)) (define outputmovie “coolthing.avi”) (define meshfile “model/thesetup.msh”) (define title (format #f “~a; timestep ~a” outputmovie timestep)) (load “initial-setup.scm”) (load “create-movie.scm”) (ti-menu-load-string (format #f “/solve/dual-time-iterate ~d 50” iterations)) (movie-finish) (exit)
May 3, 2006 For this presentation, a list of links and scheme files, see my website http://willem.engen.nl/uni/fluent/
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