FLACS News

What is a geometry database?

The starting point to conducting CFD simulations is to have a representative geometric model of the installation to be considered. Whether you import the geometry from files previously generated in CAD software or build the geometry in CASD, it will be stored in a geometry database for FLACS. A geometry database is an organised collection of all information about the considered geometry…

Working with a geometry database

Some installations, especially old ones, do not have any existing geometric (CAD) model in digital format. To be able to conduct CFD modelling for such installations you need to generate a representative geometric model. The most common way to create a new geometry is to build it manually based on all the information available, such as general layouts, drawings and…

How to define materials in a geometry

Materials in CASD are used to differentiate objects according to their type or their discipline. The different materials will have different colours which can be defined by the user. For a general description of the geometry database and how to work with it, please refer to the article What is a geometry database? and Working with a geometry database, respectively. Define a new…

How to build an assembly

An assembly is a group of instances of objects in a geometry. In a complicated geometry, assemblies are very useful for organizing the numerous objects in disciplines, zones etc. All geometries have at least one assembly, called the top assembly. If you are not familiar with geometry databases please read the article on Working with a geometry database. Add an Assembly To…

How to define a grating

Porous objects such as grated decks and walls are commonly encountered in facilities. In addition, porous volumes may be used to represent partially open/closed objects such as heat exchangers. For a general introduction to working with a geometry database and define new objects please read the article on Working with a geometry database. Define a grating in CASD To define a primitive to…

How to calculate porosities

The Flacs solver is based on the porosity/distributed resistance (PDR) approach. In this approach, obstructions in the flow field are represented by a three-dimensional field (porosity) that measures whether space is open to the flow (porosity = 1), partially blocked (0 < porosity < 1), or completely blocked (porosity = 0). The porosities have to be computed before a Flacs simulation can

How to import a geometry

Many installations have 3D geometric models in file formats which can be directly used in FLACS. These existing CAD files can be imported into FLACS in two different ways: the first way is to import directly in CASD; the second way uses a command-line utility called geo2flacs. In this article we will discuss both methods, and list the geometry file formats…

How to set up the FLACS-CFD license

FLACS-CFD is commercial software and protected against misuse in several ways. To legally use FLACS-CFD, you have to obtain a license. This article provides general information on how to set up and manage your FLACS-CFD license. For details on how to install the FLACS software package, please read the article on How to install FLACS. What kind of license manager does…

FLACS network license: trouble-shooting license server communication problems

When using a network license, Windows client computers intended to run FLACS sometimes have problems communicating via the network with the FLACS license server. In this case, the FLACS applications on the client (e.g. CASD, Flowvis, and the Flacs simulator) do not get permission to start and show an error message. Setting explicitly certain timeout parameters may help to solve…

How to install a license update key

When a license update or renewal is requested, you will receive it in the form of a V2C file from Gexcon. This article describes several ways to apply the update from the V2C file. Use the Admin Control Center web interface Log in to the FLACS license server, i.e. the computer where your license hardware key (dongle) is inserted into…

How to connect client computer to license server

In general, a client computer (intended to run FLACS) will automatically detect a network license server (computer having license key), when both the client computer and the license server are part of the same local network. If this (for some reason) does not happen (or the license server and the client computer are not included in the same local network),…

How to find help (+ the FLACS-CFD User’s Manual)

When you need assistance on how to use some settings or understand some parameters in FLACS, you can find help in the FLACS-CFD User’s Manual or in the Online Help. Where to find the FLACS User’s Manual The FLACS=CFD User’s Manual is available online as a hyperlinked HTML document and as a downloadable PDF file. Context help You can also access the FLACS-CFD User’s manual from the RunManager,…

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