Centrifugal Compressor Design with Ansys TurboSystem - Part 5
Solver Setup and Execution
In this final video, we focus on setting up the solver and post-processing the results for our model.
- Click on the Solution button to open the CFX Solver Manager.
- Select a double precision solution to resolve boundary layers with a fine mesh.
- Utilize a multi-processor machine with 20 processors to solve the model.
- Start the run and track the progress visually as the solution progresses through iterations.
After approximately 10 minutes, the solution is considered converged as the residuals have dropped, reaching 200 iterations. We can now proceed to the post-processing stage.
Post-Processing with CFD Post
Double-click on the Results button to open CFD Post, which offers special features for turbo machinery applications.
- Stretch the window to view the domain in CFD Post.
- Navigate to the Turbo button and initialize all components.
- Calculate elastic components.
Analyzing Blade to Blade Flow Variation
Examine the blade to blade flow variation using the flexible thread of surface tracker. This utilizes the beam master key for enhanced resistance analysis.
- Drag and drop information into the computer.
- Add screen graphic elements and data streams.
Pressure and Velocity Analysis
Set the view to observe pressure and velocity:
- Pressure increases towards the outlet, indicating proper function.
- Analyze velocity on a global and local scale to identify low velocity regions, which may indicate separation.
- Switch to vector view and apply to confirm any recirculation zones.
Meridional View and Blade Loading Charts
Use the meridional view, favored by design engineers, to examine:
- Meridional velocity, similar to observations in Vista TF.
- Pressure increase downstream.
For further analysis, consider blade loading charts:
- Examine top and bottom surface blade loading at different spans.
- Check velocity and pressure using shroud charts.
Conclusion
This concludes our presentation on the ANSYS Turbo System workflow for designing a centrifugal compressor. Thank you for your attention.
Presented by Ozen Engineering, Inc.
Our final video consists of setting up the solver and post-processing of the results for our model. So, once we click on the solution button, we have the CFX solver manager. We want to use a double precision solution because we're resolving the boundary layers with a fine mesh.
I have a multi-processor machine where I'm going to make use of 20 processors to solve our model. Then I'm going to hit start run. It is important to track the progress visually of the solution as it moves forward. As you can see here, the run has started. We're going through iterations.
Things seem to be going okay. And we're going to pick back up from the convert solution. So, after about 10 minutes, we have a convert solution, I would say, because it looks like the residuals have dropped down. We've hit 200 iterations.
We can run it some more, but it does look converged for our purposes. So, we can move on to the post-processing stage. So, we're done. We double click on the results button, which is going to bring up CFD post.
And again, there are some special features in CFD post for turbo machinery applications, which we're going to take advantage of. Okay. Let's stretch our window. And we can see our domain, CFD post. So, it looks like things are going well so far. We're going to go to the results.
We're going to go to the turbo button. And we're going to initialize all components. We're going to hit calculate elastic components. And one of the first things I'd like to look at is blade to blade flow variation. So, I'm going to click blade to blade. This is going to bring up CFD.
This is going to bring up the flexible thread of surface tracker. And we'll see. All of this is using beam master key, which means I have more room to have more resistance. So, I'm going to drag and drop my information into my computer. And as you can see here, our contact is Kevin speaking.
We are in session. We must add all of this here. And there are two checkboxes on the system administrators. Of course, they are familiar with us. But that all are in anyway. So, we're going to add screen graphic element, data stream. Let's watch the list of all the steps to create these given.
So, now you have all the steps and just slap on delete. So, what are we going to do? So, we have our view set and what we can see quickly is pressure comes in low and pressurizes toward the outlet. So, that is good news. It's doing what it's supposed to do. And let's also check our velocity.
So, I'm going to put velocity and what we are seeing is the velocity in the global scale. Let's do a local. Let's look at our velocities. And here, we can kind of see a low velocity region, which could be an indication of separation, something we want to avoid.
So, let's switch to vector view and hit apply. And see if we indeed have a recirculation zone there. And what do you know? We do have a little bit of a recirculation zone, which we might want to improve our design. So, this is one way of looking at things. Another view is the meridional view.
And this is the meridional view, which design engineers like to use. And we can look at, for example, the meridional velocity in this view. And this is somewhat similar to what we were seeing in Vista TF. You know, it would look at the meridional velocity.
Also, maybe another way to look at this is the velocity. So, this is the meridional velocity. And this is the pressure. So, we want to see pressure increase as we move downstream, which we do. So, other things, you know, we may want to look at as a designer is blade loading charts.
Let's try to bring it to the left. And here, I have a little bit of a red dot. And this is the red dot. And this is the red dot. And this is the red dot. And this is the red dot. And this is the red dot. And this is the red dot. So, we try to bring up.
So, here, we have the top and the bottom surface blade loading. We can look at it at different spans. Let's move near the hub region. Let's hit apply. Let's see if we can look at the velocity. This adds velocity into the y-axis. And we can look at how the shroud charts for pressure. Let's see.
So, these are different tools one can use to examine the design and the results and decide to make design changes. So, this concludes our presentation for the ANSYS Turbo System workflow with a design of a centrifugal compressor. Thank you. Thank you.
The title of the talk is "Centrifugal Compressor Design with Ansys TurboSystem - Part 5".
