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Explosive Simulations

Simulation And Modelling Of Water Spray In The 3d Explosion Simulation Program FLACS

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2. Summary

In a gas processing plant and in offshore platforms a gas explosion could have serious consequences, and it is therefore essential to have mitigation systems that can prevent and/or reduce unwanted scenarios. One such mitigating technique that has proved to be effective is water spray and deluge systems. Since such systems often already are installed in most industries to use in a fire situation, this has become an attractive method in fighting gas explosions. Experimental work has been done with the use of water spray, and the main results are that activation of water spray before an ignition can reduce rapid flame acceleration that otherwise could result in high-pressure build-up. Because the consequences of a gas explosion depends on many different parameters, a numerical model was developed that could handle different scenarios and give good results. The model was named FLACS (FLame Acceleration Simulator), and is a tree-dimensional gas explosion and gas-dispersing tool. FLACS is a Computational Fluid Dynamics (CDF) code....

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Explosion Simulations/Structural Analysis With FLACS and USFOS

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Abstract A structural analysis performed by Scandpower combining explosion simulations and structural analysis utilising the the computer tools USFOS and FLACS is described. As of today, the most common procedure for elastic and plastic explosion response analyses is to define the explosion load as a uniform pressure vs. time function for all surfaces and elements in the model. Capabilities of the computer tools FLACS and USFOS allow for a more refined approach, recognizing that for large geometries explosion pressure will vary in both time and spatial domain. USFOS (Ultimate Strength for Offshore Structures) (Ref. /1/) is a leading computer program for nonlinear static and dynamic analysis of space frame structures. The program accurately simulates the collapse process, from the initial yielding, through to the formation of a complete collapse mechanism and the final toppling of the structure. FLACS (FLame ACcellerator Simulator) (Ref. /2, 3/) is a computational fluid dynamics (CFD) tool for modeling of ventilation, gas dispersion and explosions in complex process areas. The FLACS code allows for monitoring...

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