Falling Ball Into Water (Dynamic Mesh) CFD Simulation, ANSYS Fluent Tutorial

  • Upon ordering this product, you will be provided with a geometry file, a mesh file, and an in-depth Training Video that offers a step-by-step training on the simulation process.
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Description

Using dynamic mesh methods to study a smooth sphere dropping into water is an interesting way to get a look into the world of fluid dynamics. This example shows how the solid object and the fluid medium interact, showing short-lived events like splash formation, wave spread, and the possible creation of air cavities. In engineering, it helps with the construction of structures that deal with water, like ships and offshore platforms. In environmental science, it helps with modeling the effects of things falling into bodies of water, which is important for understanding how erosion and sediment transport work. All in all, thank to the reference paper titled “ Experimental investigation of water entry of dimpled spheres “, the present study is conducted.

  • Reference [1]: Shokri, Hossein, and Pooria Akbarzadeh. “Experimental investigation of water entry of dimpled spheres.” Ocean Engineering250 (2022): 110992.

Experimental setup of falling smooth sphere into water [1]

Figure 1: Experimental setup of falling smooth sphere into water [1]

 

Simulation Process

The 3D model is initially designed in ANSYS Design Modeler. A separate region is sliced to create a denser grid there. 1050000 hexagonal cells established the structured grid, with a concentration around the collision area. As the title of the project suggest, it is essential to adopt Dynamic Mesh method to follow the movement of the falling ball. To be more specific, the Overset mesh technique is used along with Six-DOF option to track interactive forces between the wall and water surface. Last but not least, two phases are modeled by the Volume of Fluid (VOF) Multiphase module.

Grid generation of Falling ball into water CFD Simulation using Dynamic Mesh

Figure 2: Grid generation of Falling ball into water CFD Simulation using Dynamic Mesh

 

Post-processing

Based on the contours, there is a clear splash creation with a symmetrical, crown-like structure around the ball. This splash has a clear upward and outward action, which shows how the water moves when it collides with a smooth sphere. There are different pressure zones on the outline, with the largest pressure (shown by darker blue) right above and below the ball. One interesting thing is that a hollow or hole has formed in the water’s surface, which can be seen as a lighter blue area around the ball. This hole shows that the ball is still moving downhill and that the water can’t fill it instantly. Radial waves moving away from the point of contact region can also be seen. These are shown by circular rings with varying pressure levels. The fact that these simulations match up with the experimental results of the reference paper of how fluids would behave when an object hits them shows how well the simulation captured the interactions.

Falling smooth sphere into water using Dynamic Mesh

Figure 3: Falling smooth sphere into water using Dynamic Mesh

Pressure distribution around the ball in water

Figure 4: Pressure distribution around the ball in water

FAQ

We pride ourselves on presenting unique products at CFDLAND. We stand out for our scientific rigor and validity. Our products are not based on guesswork or theoretical assumptions like many others. Instead, most of our products are validated using experimental or numerical data from valued scientific journals. Even if direct validation isn’t possible, we build our models and assumptions on the latest research, typically using reference articles to approximate reality.

Yes, we’ll be here . If you have trouble loading files, having technical problems, or have any questions about how to use our products, our technical support team is here to help.

You can load geometry and mesh files, as well as case and data files, using any version of ANSYS Fluent.

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