MicroFlo

Undertake internal or external air flow and thermal studies using Computation Fluid Dynamics (CFD).

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Overview

  • Air flow and heat transfer in and around buildings, taking into account boundary conditions such as the effects of climate, internal energy sources and HVAC systems.
  • Predict occupant comfort temperatures, air temperature and airflow; optimise supply grille placement
  • Investigate in detail natural and mixed mode ventilation strategies
  • Most of the effort is taken away and CFD can be incorporated as a vital part of the design process

> Technical Details

Resources

Related Training

  • MicroFlo

    MicroFlo training will concentrate on best practice approaches for setting up general computational fluid dynamics exercises.

Images


IES VE Microflo CFD Study Image

IES VE Microflo- Ventilation Air Displacement

IES VE CFD Microflo

Virtual Environment CFD study showing a velocity slice through the space using Microflo

IES Virtual Environment CFD study showing a velocity slice through the space using Microflo

IES Virtual Environment CFD study showing a velocity slice through the space using Microflo.

IES VE MicroFlo

IES VE MicroFlo

IES VE MicroFlo

Technical Details

How it works

MicroFlo enables you to simulate internal conditions in six easy steps:

  • Run ApacheSim to generate boundary conditions
  • In MicroFlo, select the rooms you wish to simulate. Define surface boundary conditions if not using ApacheSim, and make any adjustments (eg. you can place supply and extract grilles)
  • Add additional components (eg. people, computers, radiators)
  • MicroFlo's automatic grid generation tool creates a grid based on the shape of the model, windows, surface objects and component
  • Run and monitor simulation progress
  • Review results

Input Options

Boundary Conditions

  • From ApacheSim
    • Air temperature and moisture content
    • Surface, window and door temperatures
    • All incoming and outgoing air mass flow, temperature and moisture content through each opening
    • Convective room gains split into occupant, equipment, lighting and plant
  • Alternatively, all these properties can be defined easily through the MicroFlo interface

Surface Object Properties

  • Supply grilles
  • Extract grilles
  • Heat flux patches
  • Temperature patches

Include / exclude shading surfaces: adjacent buildings, topographical shades, local shades

CFD Components

  • Radiator
  • Air heat source
  • Solid heat source
  • Any solid component created by user

Automatic Grid Generation

  • Grids can be added to increase the detail in particular regions of the model
  • Non-fixed grids can be removed
  • Grid regions can be edited to change the density between fixed gridlines

CFD Control Settings

  • Turbulence Models: K-e (default) and Constant effective viscosity
  • User defined or MicroFlo calculated (default) surface convective heat transfer coefficients
  • Default initial surface temperatures. This is ignored if the boundary conditions file is available
  • The default size of the cell grid for automatic grid

Analysis Options

  • Simulate both internal and external air flow and thermal problems
  • Pre-set initial conditions for quicker convergence
  • Discretisation options: Upwind (default), Hybrid and Power Law
  • A simulation monitor enables you to run, pause and re-start calculations. Additional options available to:
    • Switch turbulence model
    • Switch between isothermal and thermal simulation
    • Monitor values of variables at points of choice within the domain

Outputs

  • MicroFlo predicts:
    • internal air flow temperature, direction and velocity
    • external air flow direction and velocity
    • external static pressure
  • Results are accessed via graphical views of 2D slices at any grid line. For example, if you select a particular Z-grid (eg. height) you will get a 2D X and Y-dimension display of the selected variable (eg. temperature or velocity)
  • The range, scale and colour of contours and vectors can be adjusted to improve results interpretation