Creating a Reduced Order Model for Vortex Prediction in Stirred Tank
Hello, this is Ertan Taskin from Ozen Engineering. In this video, I'll be demonstrating the steps to generate a reduced order model (ROM) for predicting vortex formation in a stirred tank.
Initial Setup
Before starting, we will begin with the Fluent job from our previous work. I would like to remind you that there is a blog on the Ozen Resources website detailing all the initial steps.
Design of Experiment
To proceed, we need to open the design of experiment screen. Here are the major selections:
- Optimal Space-Filling Design: The design of experiment will be created to fill a design space without constraints on focusing on a specific region.
- Number of Samples: 32 samples are indicated.
- Input Parameters: Four input parameters are utilized, with eight configurations for each, resulting in 32 samples.
Next, we need to update the design of experiments. Before doing that, let's preview the configurations the software will choose. These are the 32 conditions with different values for density, viscosity, speed, and liquid level. The sections are currently empty as simulations haven't been performed yet.
Simulation and File Selection
Once simulations are completed for all 32 cases, we can choose the type of file: ROMZ or FMU. FMU can be utilized in TwinBuilder, while ROMZ can be imported into Fluent. We will continue with Fluent, and I've already saved the mixing tank ROMZ.
Importing ROM into Workbench
- Open a new Workbench file.
- Bring Fluent onto the screen.
- On the setup, right-click and select Import ROM.
- Select the ROM file that was generated.
- Update the project to get green checkmarks on the setup and solution phases.
Fluent Session and Model Evaluation
Once all green checkmarks are received, open the Fluent session. In the session:
- Access the Models section to start the model.
- Navigate between the Setup and Evaluate tabs.
- In the Evaluate screen, observe the four parameters used for ROM creation with their corresponding ranges.
To visualize changes, bring up a post-processing screen by going to Graphics and Contours. Choose ROM-related cell functions and select the Water Volume Fraction Contour. Save and display to see the contour.
Parameter Impact Demonstration
By changing parameters, you can immediately see their impact on the contour:
- Reducing speed affects the current contour's speed.
- Adjusting liquid level impacts vortex size. Lower liquid levels reduce vortex size, while higher levels can eliminate it even at maximum speed.
Conclusion
This tool is excellent for exploring various parameter combinations and observing their immediate impacts after generating the ROM with the design of experiments.
For more information, please contact us at Ozen Engineering, Inc.
Hello, this is Ertan Taskin from Ozen Engineering and in this video I'll be demonstrating the steps to generate a reduced order model for predicting the vortex formation in a stirred tank. So, before doing anything, we will start with the Fluent job that we have gone through in the previous work.
And one thing that I'd like to remind you that there is a blog on the Ozen Resources website about all the initial steps. Please be sure to correct any misspelled Ansys product names as you transcribe, e.g., OptiSling should be optiSLang.
So, what we have to do, of course, we have to click here to open the design of experiment screen. So, these are the major or the default selections: Optimal space-filling design, meaning that the design of experiment will be created to fill a design space.
There is no constraint to focus on a certain region, etc., and the number of samples is indicated as 32. We have four input parameters, and the software utilizes eight configurations for each.
That's why we have 32. So, what we have to do is actually we have to get here and update the design of the experiments. But before doing that, let's preview the corresponding configurations that the software will choose.
So, these are the 32 conditions, as you see, different values of density, viscosity, speed, and the liquid level. All these sections are currently empty because the simulations haven't been performed yet. So, I skipped, of course, the simulation part.
Once the simulations have completed for all of these 32 cases, when we click here, now we are given an option to choose in terms of the type of the file. So, ROMZ or FMU. FMU can be utilized in the TwinBuilder, so it can be imported into TwinBuilder. ROMZ actually can be imported into the Fluent.
So, we will continue with the Fluent, and I have already saved the mixing tank ROMZ. So, after that, the next step is to open a new Workbench file. Once it opens, bring the Fluent on the screen. On the setup, right-click, import ROM. And that is actually my ROM file that I already generated.
So, I'll click on that. After a while, you'll see that the parameters are already brought up here. And what we have to do, we have to update the project in order to get the green checkmarks on the setup as well as the solution phases.
Once all the green checkmarks are already received, we will open the Fluent Session. So, after the Fluent session opens, let's get into models and ready to start our model here. We have two tabs here, Setup and Evaluate.
And in this Evaluate screen, we see all the four parameters that are utilized for the ROM creation with the corresponding ranges. So, once we change the number within the range, we can see the impact of that. But before doing that, we have to bring a post-processing screen in front of us.
For that reason, let's go to the graphics and contours. So, when we get to the contours section, we have to choose ROM-related cell functions, and from them, we are after the water volume fraction contour, and when we save and display, that is what we see.
Now, what I will demonstrate here, if I make a change on different parameters, I will be immediately seeing the impact of that on this corresponding contour, such as let's reduce the speed, and the impact of that will be corresponding to the speed of the current contour.
Alright, let's make this 30 again and hit evaluate. And as you see now, the vortex is visible. So, we have options of, of course, looking at the different parameters. One might be interesting to take a look at the liquid level. So, let's drop the liquid level to one of the low options.
The liquid height dropped, and that definitely impacted the size of the vortex. Let's increase the height to the maximum. Now you see, when we have more fluid, even with the highest speed of the current study, the vortex is pretty much eliminated.
So, as you see, this is a very good tool to explore all different kinds of combinations and see the impact of that immediately after, of course, you generated the ROM with the design of experiments. I think this is all for this video.
Please contact us at https://ozeninc.com/contact for more information.
