Simulation Fluid-Structure Interaction 2D Water Wheel
In this simulation of a fluid-structure interaction a 2D water mill is set in motion by a water jet. The water mill is modeled as a rigid body and has only rotational degrees of freedom around the z-axis.
The fluid-rigid body interaction simulated in this study is solved fully coupled with the Lagrangian method. Fully coupled means that the motion (translation and rotation) of the water mill (= the rigid body) and the fluid variables for velocity and pressure are solved simultaneously in a large solution matrix (no iterative switching back and forth between the solution variables necessary). In engineering, this fluid-structure coupling (FSI Fluid-Structure-Interaction) refers to the consideration of the mutual influence of moving, not necessarily rigid bodies and a flow. The interaction between fluid flow and bodies occurs in many physical applications.
The water flow causes the rigid bodies to rotate due to the forces and torques exerted on the bodies by the fluid. Conversely, the movement of the water mill 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. If several rigid bodies are involved, the movement of one body can of course also be influenced by collisions with other bodies.
As with every rigid body in the FS coupling, the water mill, which is mounted around the z-axis, is assigned a weight and a mass moment of inertia. The rigid body thus behaves in accordance with the forces acting on it from the fluid. Conversely, of course, the flow is also influenced by the rigid bodies. The water mill is positioned here without any friction, i.e. it can turn without any force.
NOGRID points can be perfectly used for designing and problem solving for all kinds of FSI processes. NOGRID points helps to understand the flow by being able to compute and visualize the mass, momentum and motion of single and multiple rigid bodies. You receive transient values with which you can analyze and evaluate the efficiency of the components or processes.
NOGRID unites abilities to handle free surface flow and moving parts in the domain 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 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
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