# SSI Simulation of a Beam falling on a Rubber Body

In this article we present a Structure-Structure Interaction (SSI) simulation of a falling beam falling on a rubber body. We have computed three scenarios:

Figure 1: SSI rigid body simulation of beam falling on rubber body within NOGRID points

Figure 2: Animation of the rigid body simulation of a beam falling on a rubber body

Figure 3: SSI simulation of a rigid beam falling on an elastic rubber body within the NOGRID points' GUI

Figure 4: Animation of a SSI simulation of a rigid beam falling on an elastic rubber

Figure 5: GUI view on a SSI simulation of an elastic beam falling on an elastic rubber

Figure 6: Animation of SSI simulation of an elastic beam falling on an elastic rubber body

1. Rigid Body Simulation: Both bodies behave like rigid bodies, and the impact is completely elastic. This is referred to as a so-called Rigid Body Simulation (RBS).

2. The falling beam remains a rigid body and the second body behaves linearly elastic (Hooke's law), i.e. it can deform geometrically. This is already a real Structure-Structure Interaction (SSI) Simulation. Since one body is still rigid, one speaks of a one-sided structure-structure coupling.

3. Both bodies behave like elastic solid bodies and deform due to the collision. In this example, linear elasticity was assumed for both bodies, but all other non-linear structural laws can also be used (e.g. Maxwell models).
Rigid Body Simulation (RBS) is the simulation of the transient movement of rigid bodies. Rigid body mechanics is about physical bodies that are not deformable. During the simulation, the rigid bodies move, but the shape or structure remains unchanged. Various types of forces can act on the rigid body: gravity, magnetic forces, frictional forces, etc. These forces accelerate the rigid body and the translational and rotational speeds change. In addition, there can be collisions between the rigid bodies. Collisions suddenly change the translational and rotational speeds of the bodies involved.

This model can act as basis for more complex structures and will give you a better understanding of the fluid structure coupling and helps to improve your design regarding efficiency and costs.

NOGRID points can perfectly be used for designing and problem solving for all kinds of FSI processes. The structure deformation, the temperature and the cooling/heating rate can be predicted. NOGRID points helps to understand the flow by visualization of the mass, momentum and heat transfer of single and multiple phases. You receive integral quantities which you can use to analyze the SSI process efficiency.

NOGRID unites abilities to handle FSI problems and allows the simulation of any conceivable geometry and operation modes such as

• computation is in full 3D solving complete Navier-Stokes-Equations
• easy and intuitive setup also for SSI (Structure-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

Particular strengths of NOGRID's fluid flow CFD software are the rapid preprocessing (no fluid grid needs to be generated, only the boundary mesh, inner finite points are generated automatically depending on User setting initially and during computation), and the outstandingly short computation time even for complicated cavities.
As you can see in the image below, the boundary of the geometry still requires a mesh to allow the interior finite points to detect the boundary. The boundary must therefore be meshed and the finite points inside are automatically generated during the simulation controlled by User specifications.

## 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.

## Choose NOGRID

With NOGRID, you choose professional CFD software and services – our aim is helping you to be successful. When you decide to work with NOGRID you choose close cooperation with a dynamic, flat hierarchies-organization. Short information channels result in quick and accurate professional support and service. Our team consists of highly qualified employees, who are experts in fields such as numerical simulation or computational fluid dynamics. Based on our know-how, we are pleased to offer the following services, responding to your individual requirements:

## TRAINING

In our two-days training courses you will learn, how to use NOGRID CFD software efficiently. Our technical support team will teach you how to handle and solve different cases.

For more details please refer to Training Courses →

## Technical Support

We offer full professional support from the minute you start using our software, by telephone or by email. Contact us, when ever needed.

For more details please refer to Software Support

## Service

Lack of time or resources and other constraints often make outsourcing an attractive solution. We help you with your flow modeling needs. Based on our engineering expertise in this field we offer individual numerical simulation services matching the unique needs of your organization.

For more details please refer to Simulation Services →

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