In the present paper an embedded-boundary formulation that is applicable to fluid structure interaction problems is presented. The Navier-Stokes equations for incompressible flow are solved on a fixed grid which is not aligned with the body. A corotational formulation is used to describe the dynamics of a body that moves through the fixed grid undergoing large-angle/large-displacement rigid bod...

This paper presents the 3D dynamic formulations for a flexible beam sliding through revolute-prismatic joint. Considering geometric nonlinearity, configuration space of is nonlinear differentiable manifold (R3×SO(3)). Moreover, manipulated by joint can undergo large overall motion and slide Because difficulty mentioned above, most studies on these problems focus 2D cases or are tackled under sm...

We present a dynamic simulation framework for topologychanging deformable objects. The objects are represented using tetrahedral meshes and deformations are governed by a corotational finite element approach for linear elasticity and plasticity. Geometric constraints are employed to efficiently handle topology changes in a unified way. Topology changes comprise fracturing and merging of deforma...

In the present paper an embedded-boundary formulation that is applicable to fluid structure interaction problems is presented. The Navier-Stokes equations for incompressible flow are solved on a fixed grid which is not aligned with the body. A corotational formulation is used to describe the dynamics of a body that moves through the fixed grid undergoing large-angle/large-displacement rigid bod...

Diskoseismic c-modes in accretion discs have been invoked to explain low-frequency variabilities observed in black-hole X-ray binaries. These modes are trapped in the inner-most region of the disc and have frequencies much lower than the rotation frequency at the disc inner radius. We show that because the trapped waves can tunnel through the evanescent barrier to the corotational wave zone, th...

in this article, finite element method and ale formulation were used to numerically simulate impact of low-velocity specific projectiles with water surface. for the simulation, ls-dyna finite element code was used. material models which were used to express behavior of air and water included null material model. for the projectile, plastic-kinematics material model was applied. mie-gruneisen eq...

Abstract The 3D deployable frames studied in this work are structures composed of elastic beam elements connected by complex joints. During transformation a controlled snap-through allows the instantaneous stabilization structure an open and closed, compact configuration. mechanics is highly nonlinear, since it relies on finite rotations structural elements. It also strongly influenced geometri...

Accurate assessment of demand and capacity of structures is critical in developing performance-based design methodologies. In this research, new methods are presented towards quantifying demand and capacity of RCFT frames and members. An experimental database was compiled documenting local damage levels of RCFT members. The quantified information collected from the experiments was utilized in c...

We present a novel convex formulation that models rigid and deformable bodies coupled through frictional contact. The incorporates new corotational material model with positive semi-definite Hessian, which allows us to extend our previous work on the of compliant contact large body deformations. rigorously characterize approximations implementation details. With proven global convergence, effec...