Introduction ] [ The Modules ] [ Requirements ] [ Development and Marketing ]


Comflow® is an inexpensive, easy-to-use Computational Fluid Dynamics (CFD) package for the design of process equipment. It is designed for the use by engineers with expertise in fluid flow but not necessarily in CFD. In general, Comflow® calculations will be less accurate than calculations using the large 'scientific' CFD codes, but more accurate than calculations based on the various empirical and heuristic design rules in common use.

The pre-processor of Comflow® is of ingenious simplicity: the geometry is set up by means of defining blocks, triangles and circles. The objects of types "Obstructions", "Components" and "Boundaries" offer enormous possibilieties to model the desired geometry. Defined objects can be easily manipulated or duplicated. The object positions are given in terms of x and y co-ordinates. (Click figure beside to enlarge)

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The grid is also easy to generate or to adjust.

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The input is (as much as possible) given in quantities that are familiar to the engineer. For instance, perforated plates can be specified with hole diameter, pitch and thickness. Empirical relations are used to calculate the flow resistance from this input data, using the local fluid and flow characteristics. In no time a geometry can be set up (Click figure beside to enlarge).

The solver of Comflow® is started from within the pre-processor with a minimum of additional data. More expert users can select some advanced options to accelerate the convergence process. While calculating, the solver shows the status of the convergence of the calculation or results of defined monitor points by means of graphs. (Click figure beside to enlarge)

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Results of the calculation can be viewed in the post-processor. The Post-processor uses the geometry defined in the pre-processor in which various varables are plotted, such as velocity, pressure or temperature. Different plot styles are available, such as vectors, contour lines, colour filled plts and streamlines. Also options as mirror, rotate and colour scheme are available. Additional text or drawings can be added to the plot (Click figure beside to enlarge).

All variables can be plotted in a X/Y-variable plot. For a variable, plots on different positions can be plotted. Additional text or drawings can be added to the plot (Click figure beside to enlarge).

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The modules

Comflow® has four 'modules'. Three modules are developed specifically for three seperate (but sometimes overlapping) application areas: the Ducting, the Conjugate Heat Transfer (CHT) and the Reactor module. The fourth module Transient enables transient calculations.

The Ducting module gives access to the basic Comflow® functions to calculate the flow and pressure field inside ducts of various geometry. The geometry can be defined using square, circular and triangular blockages. Components that are available in comflow are a.o. porous and perforated plates, perforated blocks, porous regions, tube bundles, axial and radial fans.

The CHT (Conjugate Heat Tranfer) module adds the ability to calculated heat transfer from the fluid to solids inside the flow. Thus, the temperature field in the fluid as well as inside solid regions can be computed.

The Reactor module, still under development, allows the computation of chemical reaction and flow in fixed catalyst beds within a Comflow® model. The heat and mass transfer from the fluid to the catalyst particles is computed as well as the diffusion inside the particles. Thus, the effectivity of the catalyst particles is calculated as a function of the local fluid velocity, temperature and composition.

The Transient module enables transient calculations in combination with the ducting and CHT module but NOT for the reactor module.


Any standard PC with an Intel Pentium processor, 32 MB of memory (depending on the operating system), about 5 MB free hard disk space and Microsoft Windows 95, 98, ME, NT or XP, is able to run Comflow® There is no need for special hardware.

The input data for Comflow® is given in quantities that are familiar to the engineer. For instance, bundles can be specified by the direction of the tubes, diameter, pitch and if necessary fin height and thickness. There is no need for extensive training courses.

Development and Marketing

Comflow® has been developed for INUDENT, the society for INdustrial Use and Development of ENgineering Tools.

© 2008 Inudent
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