Simulation Fluid-Structure Interaction 2D Sliding a filled Cup
The 2D simulation of a fluid-structure interaction (FSI) of a water-filled cup sliding can be performed with NOGRID points CFD software.
In this fluid-structure coupling, a boundary wall is switched off at a defined time. A cup filled with water is then accelerated by gravity and slides down an inclined plane. The cup is modeled as a rigid body that is free to move unconstrained when forces act on it. The single rigid body may collide with the bottom wall, which can alter its direction of motion. The collisions are assumed to be perfectly inelastic collisions in this study. An inelastic collision, unlike an elastic collision, is a collision in which the kinetic energy is not conserved due to the action of internal friction. The software is able to compute both collision regimes controlled by a plasticity coefficient.
The fluid-rigid body interaction simulated in this study is solved in a fully coupled manner using a Lagrangian approach. Fully coupled means that the motion of the filled cup (translation and rotation of the rigid body) and the fluid variables for velocity and pressure are solved simultaneously in a large solution matrix (without the need for iterative switching back and forth between the solution variables necessary). In engineering, the term fluid-structure interaction (FSI) refers to the consideration of the mutual influence of moving, not necessarily rigid bodies, and a flow. Such interactions between fluid flow and bodies occur in many physical applications.
The fluid flow inside the cup causes both displacement and rotation of the rigid bodies due to the forces and torques exerted on the bodies by the fluid. Conversely, the motion of the cup causes changes in the flow. If the flow also changes due to the structure, there is a so-called real, two-sided fluid-rigid-body coupling. When several rigid bodies are involved, the motion of one body can additionaly also be affected by collisions with other bodies.
The cup in this simulation is assigned a weight and a mass moment of inertia, as is the case for any rigid body in FSI coupling. The rigid body responds according to the forces and torques exerted on it by the fluid. Conversely, of course, the flow is also influenced by the motion of the rigid body. The cup is assumed to slide smoothly on the ground in this case, meaning no resistance is introduced at the contact. In this study, friction between rigid bodies is neglected. The law of Coloumb friction (also referred to as dry or dynamic friction) is implemented for interactions between rigid bodies and walls, but it can be deactivated - as was done in this simulation.
NOGRID points can be effectively applied to the design and problem solving of all kinds of FSI processes. The software helps to understand the flow by computing and visualizing the mass, momentum, and motion of single as well as multiple rigid bodies. It provides transient data that can be used to analyze and evaluate the performance and efficiency of components or processes.
Capabilities of NOGRID points CFD software
NOGRID combines capabilities to handle free surface flow and moving parts in the domain and allows the simulation of any conceivable geometry and operating modes, such as
- computation is in full 3D solving complete Navier-Stokes-Equations
- easy and intuitive setup also for FSI (Fluid-Structure-Interaction) cases
- free definable material properties by equations or curves
- evaluation of chemical reactions and corresponding heat source terms
- open or closed domains including inflow and outflow areas (non-batch mode)
- moving of parts
Nogrid's strengths
Easy and fast modelling: Build geometry, mesh boundary, setup the case and start computation
What is CFD from NOGRID?
CFD solves the fundamental equations that define the fluid flow process. With CFD software from NOGRID every engineer makes better decisions by predicting, analyzing and controlling fluid flow, heat and mass transfer or chemical reaction. By using NOGRID software for flow modeling you receive information on essential flow characteristics as for example flow distribution. Using it additional to testing and experimentation NOGRID software helps to improve the evaluation of your design – resulting in better construction and operation parameters, increasing planning security and money savings due to faster time to the marketplace for your product or process.
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