Design of an Axial Fan Using Ansys TurboSystem - Post-processing
Hello, welcome to the final edition of our workflow. Up to now, we have designed a simple axial fan blade. We went through some initial analysis, then for a more realistic analysis, we meshed our model and executed a CFD model. In this step, we're going to take a look at the results using CFD Post.
CFD Post Overview
I'm not going to go into a lot of detail on how to use CFD Post. Instead, I will focus on the actual results and the specialized turbo system tools that make turbo machinery post-processing easier.
Loading and Initializing Results
- Load the results.
- Hit Turbo.
- Initialize all components.
- Calculate the last components.
We now have shortcuts to get quick results for turbo systems and related solutions.
Blade to Blade View
One key aspect to examine is the blade-to-blade view of the flow. When designing a blade, you want to avoid flow separation on your rotor or stator plates.
- Look at the mid-span.
- Examine local velocity.
- Add at least two instances since we modeled only one of the 30 fan blades.
- Hit Apply.
This quickly provides the velocity field view. Fortunately, there is no significant separation region, which would have appeared as a large blue region. This indicates a good design.
Vector View
- Switch from contours to a vector view.
- Hit Apply to place vectors on each cell.
- Adjust sampling to 1,000 for better resolution.
- Zoom into the flow field to check for recirculation zones.
There are no recirculation zones, confirming the design's effectiveness.
Contour and Report Generation
- Return to the original view and switch back to contour view.
- Default view shows pressure; switch to local velocity.
- Save a picture of the velocity contours if desired.
- Hit the Figure button to insert a figure named Figure 1.
Generate any type of vector or contour plot using these options. Use the Report View for quick report generation from a CFX or Fluent model.
Blade Loading Analysis
As a designer, blade loading is crucial. It represents the pressure load on the pressure and suction sides of the airfoil. The area between these gives the work done by the blade.
- Examine different spans, such as near the hub section (10%) or near the tip (90%).
- Hit Apply to view the blade loading chart.
This information helps designers decide on potential geometry changes.
Conclusion
In conclusion, this presentation covered how to post-process a turbo machinery CFD model. For more information, please refer to Ozen Engineering, Inc.
Hello, welcome to the final edition of our workflow. Up to now, we have designed a simple axial fan blade. We went through some initial analysis, then for a more realistic analysis, we meshed our model and then we executed a CFD model.
In this step, we're going to take a look at the results using CFD post. I'm not going to go into a lot of detail on how to use CFD post. I'm going to focus more on the actual results. I'm going to focus on the specialized turbo system tools to make turbo machinery post-processing easier.
So, for that, we loaded our results. We're going to go to Turbo. We're going to initialize all components. And then calculate the last components. Now we have these shortcuts to get quick results for turbo systems. One key thing I like to look at is the blade-to-blade view of the flow.
Because, a lot of times when you design a blade, you don't want flow separation on your rotor or stator plates. The way to do it is to look at the blade-to-blade view. We're going to look at the mid-span. We're going to look at our velocity. Let's do local velocity.
Now, what I would like to do is maybe add at least two instances because we modeled only one of the 30 fan blades. And we're going to hit apply. This is very quickly going to get us the right view, without any user input, the velocity field.
And what we quickly see is there really is no big separation region. It would have shown up as a blue, big blue region. So that is good news. It's a good design. Another way to look at it is right now we're looking at contours. We can switch to a vector view. Let's hit apply.
And this is going to put vectors on each cell. Again, let's see. So we want to maybe change the sampling. Let's do equal. Let's do equal. Let's do equal. Let's do equal. Let's do equal. Let's do equal. Let's do equal. Maybe 100 is not enough. Let's make it 1, 000. Okay.
And then, for example, zoom in to the flow field. And, you know, we really don't see any recirculation zones. So that's good. And we can, you know, go back to our original view. Go back to our contour. Apply. So, you know, the default is to show pressure.
And what I wanted to see is, again, go back to velocity. Local. And I do want to save a picture this time. So now, you know, we're looking at some velocity contours. If I decide I like this view, I'm going to go hit the figure button. And insert a figure now named figure one. All right.
And, you know, you can generate any type of vector contour plot using these options. If I go back to Turbo, we're going to get back to our view. I'm going to. There are also some turbo macros, which I'm not going to go into. But what I'd like to go into is the report view.
If I click on the report view, this is a very quick way to generate reports out of a CFX or a Fluent model. And this particular one is fine-tuned for a fan solution. But, you know, you can add and delete components. You can have, you know, the physics.
You can have the You know, you can turn on and off. If you don't want to give mesh information. You know, you can untick those. You have control over the contents of the report here. So going back to Turbo, another key piece of information we want is as a designer, it's blade loading.
Blade loading is essentially the pressure load on the pressure and the suction side of your airfoil. So here and you know, the area between the two is it's the work gives you the work. So larger, this is it's doing more work and you want can quickly look at, you know, different spans.
For example, let's go near the show around 90% of it apply. And then we see slightly different blade loading or near the hub section. You know, we go around 10% hit apply. And we can see our blade loading chart.
So a designer may look at these and, you know, this decides to make certain changes on the geometry. This is very helpful. And what's also nice is if we go to report viewer, if we hit refresh and we're going to see. You know, the chart added to our report.
So this concludes our presentation on how to post-process a turbo machinery CFD model.
