FLACS (FLame ACceleration Simulator) is a commercial

Computational Fluid Dynamics Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid flows. Computers are used to perform the calculations required to simulate th ...

(CFD) software used extensively for

explosion An explosion is a rapid expansion in volume associated with an extreme outward release of energy, usually with the generation of high temperatures and release of high-pressure gases. Supersonic explosions created by high explosives are known ...

modeling and

atmospheric dispersion modeling Atmospheric dispersion modeling is the mathematical simulation of how air pollutants disperse in the ambient atmosphere. It is performed with computer programs that include algorithms to solve the mathematical equations that govern the pollutant ...

within the field of industrial safety and

risk assessment Broadly speaking, a risk assessment is the combined effort of: # identifying and analyzing potential (future) events that may negatively impact individuals, assets, and/or the environment (i.e. hazard analysis); and # making judgments "on the to ...

. Main application areas of FLACS are in

petrochemical Petrochemicals (sometimes abbreviated as petchems) are the chemical products obtained from petroleum by refining. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sou ...

process manufacturing Process manufacturing is a branch of manufacturing that is associated with formulas and manufacturing recipes,

food processing Food processing is the transformation of agricultural products into food, or of one form of food into other forms. Food processing includes many forms of processing foods, from grinding grain to make raw flour to home cooking to complex industr ...

wood processing Wood processing is an engineering discipline in the wood industry comprising the production of forest products, such as pulp and paper, construction materials, and tall oil. Paper engineering is a subfield of wood processing. The major wood pro ...

, metallurgical, and

nuclear safety Nuclear safety is defined by the International Atomic Energy Agency (IAEA) as "The achievement of proper operating conditions, prevention of accidents or mitigation of accident consequences, resulting in protection of workers, the public and the ...

industries. FLACS has dedicated modules to simulate

gas explosion A gas explosion is an explosion resulting from mixing a gas, typically from a gas leak, with air in the presence of an ignition source. In household accidents, the principal explosive gases are those used for heating or cooking purposes such as nat ...

dust explosion A dust explosion is the rapid combustion of fine particles suspended in the air within an enclosed location. Dust explosions can occur where any dispersed powdered combustible material is present in high-enough concentrations in the atmosphere or ...

and explosions involving chemical explosives like

TNT Trinitrotoluene (), more commonly known as TNT, more specifically 2,4,6-trinitrotoluene, and by its preferred IUPAC name 2-methyl-1,3,5-trinitrobenzene, is a chemical compound with the formula C6H2(NO2)3CH3. TNT is occasionally used as a reagen ...

. FLACS is also extensively used to simulate flammable and toxic gas dispersion. It was applied in the investigation of many high profile accidents such as

Buncefield fire The Buncefield fire was a major fire at an oil storage facility that started on 11 December 2005 at the Hertfordshire Oil Storage Terminal, located near the M1 motorway, Hemel Hempstead, in Hertfordshire, England. The terminal was the fifth ...

Piper Alpha Piper Alpha was an oil platform located in the North Sea approximately north-east of Aberdeen, Scotland. It was operated by Occidental Petroleum (Caledonia) Limited (OPCAL) and began production in 1976, initially as an oil-only platform but la ...

TWA Flight 800 Trans World Airlines Flight 800 (TWA800) was a Boeing 747-100 that exploded and crashed into the Atlantic Ocean near East Moriches, New York, on July 17, 1996, at about 8:31pm. Eastern Daylight Time, EDT, 12 minutes after takeoff from John F. K ...

,Sandia report on modeling TWA-800 tank explosion http://www.galcit.caltech.edu/resources/search_galcit?q=flacs and the

Petrobras 36 ''Petrobras 36'' (''P-36'') was at the time the largest floating semi-submersible oil platform in the world prior to its sinking on 20 March 2001. It was owned by Petrobras, a semi-public Brazilian oil company headquartered in Rio de Janeiro. The c ...

platform.

History

FLACS software development started in-house in the early 1980s under the sponsorship program, Gas Explosion Safety (GSP), funded by the oil companies BP,

Elf Aquitaine Elf Aquitaine is a French brand of oils and other motor products (such as brake fluids) for automobiles and trucks. Elf is a former petroleum company which merged with TotalFina to form "TotalFinaElf". The new company changed its name to Total in ...

Esso Esso () is a trading name for ExxonMobil. Originally, the name was primarily used by its predecessor Standard Oil of New Jersey after the breakup of the original Standard Oil company in 1911. The company adopted the name "Esso" (the phonetic p ...

Mobil Mobil is a petroleum brand owned and operated by American oil and gas corporation ExxonMobil. The brand was formerly owned and operated by an oil and gas corporation of the same name, which itself merged with Exxon to form ExxonMobil in 1999. ...

Norsk Hydro Norsk Hydro ASA (often referred to as just ''Hydro'') is a Norwegian aluminium and renewable energy company, headquartered in Oslo. It is one of the largest aluminium companies worldwide. It has operations in some 50 countries around the world an ...

and

Statoil Equinor ASA (formerly Statoil and StatoilHydro) is a Norwegian state owned enterprise, state-owned multinational energy company headquartered in Stavanger. It is primarily a petroleum company, petroleum company, operating in 36 countries with ad ...

. FLACS-86 was released to GSP sponsors in 1986. Continuous research and development from then onwards resulted in many commercial releases. In 2006, FLACS v8.1 was released to customers. Till then FLACS was developed for

Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and ot ...

and

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...

platforms. In 2008, however, FLACS v9.0 was released for

Microsoft Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for serv ...

platform. FLACS v9.1 and FLACS-Wind was developed in 2010. A fully parallelized FLACSv10.0 (using

OpenMP OpenMP (Open Multi-Processing) is an application programming interface (API) that supports multi-platform shared-memory multiprocessing programming in C, C++, and Fortran, on many platforms, instruction-set architectures and operating syste ...

) with a new solver for incompressible flows was released in 2012. FLACSv10.0 also constitutes a Homogeneous Equilibrium Model (HEM) for

two-phase flow In fluid mechanics, two-phase flow is a flow of gas and liquid — a particular example of multiphase flow. Two-phase flow can occur in various forms, such as flows transitioning from pure liquid to vapor as a result of external heating, separ ...

calculations.

Related software

* CFX (proprietary software) * Fire Dynamics Simulator (GPL) *

OpenFOAM OpenFOAM (for "Open-source Field Operation And Manipulation") is a C++ toolbox for the development of customized numerical solvers, and pre-/post-processing utilities for the solution of continuum mechanics problems, most prominently including ...

(GPL) * KFX DNV GL

References

{{reflist

External links

FLACS official website

GexCon AS
(FLACS developers) Computational fluid dynamics

History

Related software

See also

References

External links