Flow from a Circular Vent- Ansys CFX Tutorial
In this tutorial you will learn about:
• Setting up a transient problem in CFX-Pre.
• Using an opening type boundary in CFX-Pre.
• Making use of multiple configurations in CFX-Pre
• Modeling smoke using additional variables in CFX-Pre.
• Visualizing a smoke plume using an Isosurface in CFD-Post.
• Creating an image for printing, and generating a movie in CFD-Post.
In this example, a chimney stack releases smoke that is dispersed into the atmosphere with an oncoming
side wind of 1 m/s. The turbulence will be set to intensity and length scale with a value of 0.05, which
corresponds to 5% turbulence, a medium level intensity, and with an eddy length scale value of 0.25
m. The goal of this tutorial is to model the dispersion of the smoke from the chimney stack over time.
Unlike previous tutorials, which were steady-state, this example is time-dependent. Initially, no smoke
is being released. Subsequently, the chimney starts to release smoke. As a postprocessing exercise, you
produce an animation that illustrates how the plume of smoke develops with time.
To download the files and resources used in this video-
https://res-download.herokuapp.com/
1.0E-5 [m^2 s^-1] is a representative kinematic diffusivity value for smoke in air.
expressions
TimeConstant 3 [s]
FinalConcentration 1 [kg m^-3]
ExpFunction FinalConcentration*abs(1-exp(-t/TimeConstant))
#CFXPre #CFDPost #TransientProblem #BoundaryConditions #MultipleConfigurations #SmokeModeling #AdditionalVariables #Isosurface #SmokePlume #Visualization #ChimneyStack #SmokeDispersion #AtmosphericSimulation #SideWind #Turbulence #EddyLengthScale #TimeDependentSimulation #Animation #PostProcessing #KinematicDiffusivity #CFDAnalysis #Simulation #EngineeringSimulation #FluidDynamics #SmokeSimulation #EnvironmentalModeling #CFX #ComputationalFluidDynamics