Vibrating Screen Simulation, Part I: Efficiency

Hi everyone, thanks for joining this tutorial. This time we will simulate a vibrating screen to determine its efficiency using ANSYS Rocky. So, let's proceed with the setup. Click on the new project icon and save it accordingly.

In the study section, write some notes related to the setup of the model. For physics, ensure that gravity is enabled. The adhesive force is excluded this time, but select the rolling resistance model. Import the geometry of the screen in STL format and select millimeters as the input unit.

Now, drag and drop the geometry into the workspace. Remember to use the mouse options to rotate, pan, and zoom in and out. You can also change the color of the background and text if needed. In this step, we will create the inlet surface for the screen.

In the next step, we will create the inlet surface for the feed flow of particles. Change the coordinates and sizes as shown. If you are using your own geometry, use appropriate values. Now, let's take a look at the vibration motion. We have the feed material that goes through the screen.

This results in two flows, the overflow and the underflow. But the screen needs a vibration motion. In general, ANSYS Rocky allows to set up several parameters, but for a linear vibration, we need only three of them. First, the amplitude. Second, the frequency.

And third, the phase that determines the initial position. The slope of this system is the same as the slope of the screen. The slope of the screen is 35 degrees, and it's a parameter that may change in further simulations. Now, we are going to set up the motion.

Create the motion frame with the slope angle. Next, add a new motion. As mentioned before, select Periodic Translation. Now, create two variables. These will be input variables for the optimization in part 2. Enter the name of each variable and then specify the value for this simulation.

You can view the input variables so far from the Tools tab. Finally, add the vibration motion to the screen. For this demo, we will work with the default material properties and the material interactions. If you want, you can check the values by picking on both lists.

Now, it's time to create the particles. Remember that in this demo, we will work with the particle size distribution, the one shown on the graph. Create the new spaces and type the values accordingly. Open the scrubby texture in the billing picture.

Use the virtual2.rom from our diagram followed by your typesbait. Our data plot will act as a render function, where we can instantly headset the measure. The mu, and mi after each change must be addressed in the measure. Inlet and select the rectangular surface and the particles.

In this step, type the mass flow rate and the time. In Domain Settings, we have to define a custom boundary box that exceeds the limit of the geometry. This will allow ANSYS Rocky to compute the particles in the overflow region.

Finally, in the solver, define the simulation time, decrease the time step, and select the number of cores for processing the simulation. Once the simulation is finished, we can proceed with the post-processing. Go to Repairing and select the simulation.

In the particle section, select particle size. In the animation, observe the screen vibrating and how the underflow and overflow appear. You can also select another property for the counter plot. For this demo, we need to extend the screen. We can also change the size of the screen.

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To calculate the efficiency, we have to create two regions to quantify the particles, and create three properties to filter those particles. Here you see a graphical explanation of the mass information needed for the efficiency calculation. So now, let's create the two regions first.

Begin with the region for the underflow particles, those that have 180 millimeters or less in diameter. Use the coordinates as shown, and you will see how the region updates automatically. Next, create the region for the overflow particles, also using the given coordinates.

Next, create the region for the overflow particles, also using the given coordinates. Let's continue defining the three properties mentioned before. Remember that we need those properties to filter the particles in both regions. The first filter is for the small particles in the feed.

By saying small particles, our region will be filled with those particles. The second filter is for the large particles in the feed. This time, the term large particles refers to those with more than 180 millimeters in diameter. And the last filter is for the large particles in the overflow.

So this time, it must be created from that region. Next, create the region for the large particles in the feed. By saying large particles, our region will be filled with those particles. This time, the whole portion of the pipe width, and useful select the unit and click in particle mass n.

We must type this expression that returns the cumulative sum of the particle's mass over time. As a result, you will see the custom curve in the list even for each of the four groups of particles. Let's create a time plot to see their evolution over time.

Drag and drop the custom curves to the time plot. You will see the difference in the undersized particles that mainly affects the efficiency. Now at last, the time has come to calculate the efficiency. This can be done in the table by creating the three equations and then visualizing the results.

Scroll down to see the maximum efficiency. This screen has 67%, as you can see how several small particles are still present in the overflow. This is an opportunity to imagine how the maximum efficiency of the particle is.

The maximum efficiency of the particle is the maximum efficiency of the particle. This is an opportunity to improve the screen performance. And now, time for an extra tip. Export the data from the columns you want and create a plot. This concludes the first part.

See you in the second video for the optimization. Thanks for watching.