Abstract: A particle-based method model containing a number of particles for representing a domain of an explosion event in a time-marching simulation is received in multi-processor computer system. The domain is divided into a set of sub-domains with each sub-domain containing substantially equal number of particles. Sub-domains are assigned to respective processors of the computer system. Numerically-calculated particle behaviors are obtained by conducting time-marching simulation in parallel computations according to the particle-based method. When the simulation time has not reached a predefined termination time, total number of particles in each sub-domain is summed up after each solution cycle. If an indicator derived from the total number of particles in each sub-domain shows workload imbalance, the domain is repartitioned with number of particles rebalanced into new set of sub-domains before conducting further time-marching simulation.

Abstract: Methods and systems for numerically simulating structural failure with clusters of bonded discrete elements representing a failed portion of the structure are disclosed. A computerized mesh model representing a structure is received in a computer system. The computerized mesh model containing at least a plurality of finite elements with a subgroup of adaptive elements included therein. A corresponding cluster of discrete elements and connecting bonds for each adaptive element are created based on a set of predefined criteria. The discrete elements and the connecting bonds are initially set to a state of pre-active, and connecting bonds are used for connecting discrete elements to one another within each cluster. Numerically-calculated structural behaviors are obtained by conducting a time-marching simulation for a predetermined duration in a plurality of solution cycles using the computerized mesh model with a scheme for processing the adaptive elements and corresponding clusters of discrete elements.

Abstract: Numerical blast simulation methods and systems are disclosed. SPH model containing a plurality of SPH particles representing a physical domain is received. Each SPH particle is associated with an influence function having a domain of influence. Blast source model containing at least one simulated gas particle is created. The blast source model, defined by a set of explosion characteristics, represents the explosion just before impacting the physical domain. Each simulated gas particle is associated with a set of properties that includes a mass, a velocity vector and a location. Numerically calculated domain behaviors in response to the explosion are obtained by conducting a time-marching simulation for a predetermined duration in a plurality of solution cycles using the SPH model and the blast source model, the domain behaviors are a result of combined interactions between said each simulated gas particle and a corresponding subgroup of the SPH particles.

Abstract: Systems and methods for numerically simulating inflation of an airbag configured with more than one connected flexible-boundary volumes (i.e., primary and secondary pouches) are disclosed. A finite element analysis model of such airbag is defined in the airbag's folded configuration. Numerical simulation of inflating the primary pouch is based on corpuscular particle theory by interacting simulated corpuscular or gas particles with one another and with the shell elements representing the primary pouch. The simulated corpuscular particles are created by flow characteristics generated by an explosive blast. Numerical simulation of inflating the secondary pouch is based on control volume theory by converting kinetic energy of those of the simulated corpuscular particles having flowed through the interconnected opening from the primary to the secondary pouch to a uniform pressure. The uniform pressure is then applied onto the shell elements representing the secondary pouch.

Abstract: System and method of simulating large deformation and rotation of a structure in a finite element analysis used for improving structural design is disclosed. A solid finite element is configured for simulating large deformations and/or rotations of a structure. The solid finite element comprises only corner nodes with each node having six degrees-of-freedom (DOF), three translational and three rotational. In other words, each node is configured to include translational deformation and rotation deformation, each of the translational and rotational deformation has three components corresponding to one of the six DOFs. The solid finite element has a plurality of external edges. Each external edge has two ends, each end is located at one of the adjacent corner nodes. Additionally, translational deformation at mid-edge point of each external edge is implicitly embedded in the translational and rotational deformations of two adjacent corner nodes.

Abstract: System and method of simulating large deformation and rotation of a structure in a finite element analysis used for improving structural design is disclosed. According to one aspect, a special purpose solid finite element is configured for simulating large deformations and/or rotations of a structure. The special purpose solid finite element comprises only corner nodes with each node having six degrees-of-freedom (DOF), three translational and three rotational. In other words, each node is configured to include translational deformation and rotation deformation, each of the translational and rotational deformation has three components corresponding to one of the six DOFs. According to another aspect, the special purpose solid element has a plurality of external edges. Each external edge has two ends, each end is located at one of the adjacent corner nodes.