FEA and CFD Based Simulation of Blast, Explosion & Fire

Contemporary design requirements associated with the protection of life and property often require consideration for blast effects resulting from either accidental or intentional explosions. Proper treatment of blast effects in structural systems requires specialized knowledge ranging from non-linear responses of structures to short-duration dynamic loading. Enteknograte’s Research engineers have extensive training and experience in managing all structural response considerations related to high-energy events, including blast design, explosion effects and mitigation, and finite clement modeling of blast events.

Design and validation of structures against blast loads are important for modern society in order to protect and secure its citizen. Since it is a challenge to validate and optimise protective structures against blast loads using full-scale experimental tests, we have to turn our attention towards advanced numerical tools like the finite element method. Several different finite element techniques can be used to describe the response of structures due to blast loads. Some of these are:

• A pure Lagrangian formulation,
• An initial Eulerian simulation (to determine the load) followed by a Lagrangian simulation (for the structural response) and
• A hybrid technique that combines the advantages of Eulerian and Lagrangian methods to have a full coupling between the blast waves and the deformation of the structure.

Ideally, all blast simulations should be carried out using the fully coupled Eulerian-Lagrangian approach, but this may not be practical as the computational time increases considerably when going from a pure Lagrangian to a fully coupled Eulerian-Lagrangian simulation.

Enteknograte engineers simulate the Blast and Explosion with innovative CAE and virtual prototyping available in the non-linear structural codes LS-DYNA, Ansys Autodyn, and ABAQUS. Enteknograte Engineers can simulate any type of Blast and Explosion such as air blast, Underwater explosion (UNDEX) and Fragmentation due to blast to survey structural integrity in High Rate Loading Condition.
Our engineers have strong backgrounds in FEM(Finite Element Method) and complicated Multiphysics simulation that need deep knowledge and are fluent in the codes like LS-DYNA, Ansys and ABAQUS. We can develop special purpose user subroutine (UMAT) based on clients need to empower simulation environment to overcome any complicated problem in Blast and explosion load condition and user defined material constitutive equation for composites and special purpose Concrete including fracture mechanics of concrete in different strain rate.

Computational Fluid Dynamics for BLAST, Explosion and Fire simulation

Blast loads on buildings can be determined through the use of computational fluid dynamics (CFD) computer programs. The basic premise of CFD modeling is to discretize the building and surrounding area encompassing the blast source and adjacent obstacles into small regular cells of finite volume and then solve the governing equations for conservation of mass, momentum, and energy within each cell, taking into account the effects of adjacent cells.

Among other uses, CFD is utilized to simulate the propagation of blast waves in an environment of obstacles, to simulate pressures on unusually-shaped buildings, to simulate leakage through openings into buildings, to simulate interior explosions, and to simulate near-field explosion effects. Where applicable, CFD can be used as an alternative to the more commonly used empirical methods.

It should be understood that CFD results are sensitive to modeling techniques and the software used. CFD programs can employ a true first principles approach which includes turbulence modeling and detailed combustion, or a semi-empirical approach where simplifications of the explosion source are made, based on test data and guidance, to simplify and speed the analysis. Phenomological models are sometimes used to simplify the analysis by using numerical modeling of selected explosion phenomena to capture important features of blast propagation. As with most simulations, the greater the detail of the model, the greater the potential accuracy of the result.

By using Accurate mechanisms that representing every class of explosion and Fire important for this analysis and combination of advanced computational fluid dynamics (CFD) simulation tools such as Kiva, Ansys Fluent, Ansys Forte, AVL Fire, Converge CFD, Siemens Star-ccm+ enable Enteknograte engineering team to most detailed simulation of Fire and Explosion in industrial and defense projects.