Using Meshing Fidelity in Ansys Discovery's Explore Mode for Room Cooling
Hello everyone, this is Mohsen Seraj from Ozen Engineering, Inc. This is the second part of the video series demonstrating different meshing techniques in the explore mode of Ansys Discovery.
Introduction
In the first part, I discussed how to change the mesh size, referred to as mesh fidelity, using the slide bar or global meshing with various approaches. Now, I will apply these techniques to an example involving the cooling of a room resistor.
Mesh Fidelity and Element Size
The initial element size is approximately 50 mm. Let's see what happens:
- Meshing is completed, and the solution is underway.
- The results are available in less than half a minute.
- The mesh size is approximately 54 mm.
By increasing the mesh fidelity to about 43 mm, the solution updates with the new mesh. I adjust the mesh using the slide bar and observe the effect on the solution.
Increasing Mesh Fidelity
Let's work with more fidelity:
- At 36 mm, the solution updates quickly.
- At 33 mm, the solution time remains under one minute.
- The highest fidelity achievable is 30 mm globally.
By adjusting the slide bar, I increase mesh fidelity and observe changes in parameters such as maximum velocity, temperature, and pressure drop.
Effect on Parameters
For this example, changing the mesh fidelity affects parameters as follows:
- Max Velocity: Changes from 0.85 m/s to 0.94 m/s, approximately a 10% difference.
- Temperature: Increases from 20.4°C to 22°C, again about a 10% change.
- Pressure Drop: Exhibits a higher impact from mesh size changes.
Global Mesh Fidelity Approaches
Another way to change mesh fidelity in explore mode is through global fidelity:
- Standard Fidelity: Mesh size is around 56 mm.
- Aggressive Fidelity: Mesh size decreases to approximately 44 mm.
- Extreme Fidelity: Mesh size further decreases to 34 mm, taking longer to solve.
Custom Level Fidelity
Custom levels provide another method for adjusting mesh fidelity:
- Level 1: Mesh size is 56 mm.
- Level 2: Mesh size is similar to aggressive fidelity at 44 mm.
- Level 3: Mesh size reduces to 38 mm.
Higher custom levels, such as 5 and 10, result in mesh sizes of 32 mm and 25 mm, respectively, with solution times ranging from two to four minutes.
Conclusion
In this video, I demonstrated how to change mesh fidelity in explore mode using:
- A sliding bar for mesh size adjustments.
- Global mesh fidelity schemes: standard, aggressive, or extreme.
- Custom levels for mesh fidelity.
In future videos, I will discuss local fidelity and its application in refine mode. Thank you for watching.
Hello everyone, this is Mohsen Seraj from OZEON Engineering. This is the second part of the video for showing you the different ways of meshing in Ansys Discovery's Explore Mode.
In the first part, I already talked about changing the mesh size, which we call mesh fidelity, using the slide bar or global meshing with different approaches. Now I want to use it for this example: cooling a room resistor. The fidelity is as we do know, and the size of the element is about 50 mm.
Let's see what happens. Meshing is done, and the solution is undergoing. You see it moving in white around the hexagonal elements. The results are available in just less than half a minute. With this mesh size, the preview shows a size of almost 54 millimeters everywhere.
If I change the mesh fidelity to about 43 millimeters, the solution asserts to solve the model with the new mesh. The way I change the mesh is by changing this slide bar. I can see the effect of the mesh on the solution. Now, let's work on meshing with more fidelity.
The size of the elements is now 36 millimeters, and the solution is updating fast. For 33 millimeters, the size of the elements is everywhere as you can see.
By changing this slide bar, I can increase the fidelity of the mesh, and the solution prime is also increasing but is still less than one minute. Let's go to the highest fidelity we can have, about 30 mm for the mesh. It is everywhere because it is global fidelity.
This is the highest fidelity we can have with this slide bar. I'm just waiting for the sketch to finish so I can update you on the effect of the mesh on the parameters, such as max velocity, temperature, pressure drop, or whatever. Let's change max velocity for this specific example.
With different mesh sizes or different mesh fidelity for this specific example, the velocity changes from about 0.85 mps to above 0.94 mps, which is a 10% difference in the results.
For the temperature, it is 20 degrees at the beginning with very low fidelity and then goes up to 22 degrees, which is about a 10% change in the maximum velocity we can have. For pressure drop, again, it is higher impact, changing from about 20 to 22 degrees.
Another way of changing the mesh fidelity in Explore Mode is global fidelity. Let's start with standard mesh fidelity. I already have the solution for this. The mesh size is almost 56 mm everywhere. By changing the mesh fidelity approach here, we can have another way of changing the mesh size.
The solution updates automatically. It's done. If I go from aggressive mesh fidelity to extreme mesh fidelity, the mesh size decreases from almost 44 to 34 mm for the mesh size everywhere.
It takes a little bit longer time for solving the model because it is an extreme level of fidelity for the mesh. The solution is done.
I can again check the effect of the mesh on the maximum velocity from 0.88 degrees to 0.85 and then go up to almost 0. 86. Not much difference on the maximum velocity.
For the effect of the mesh on the temperature, again, it is almost on the same range, from 20.5 degrees Celsius to almost 22. So, again, this changes just for this one in this way by changing the fidelity of the mesh. We can see how significant the effect of the mesh is on the results.
I can check also here for the custom level. If I go for just 1, the results show that at the global custom level of 1, the mesh size is 56 mm, and the level of fidelity is almost at the starting point where the slide bar for the fidelity is at a very low amount. We have the results.
If I change it to level 2, the mesh size is almost 44, similar to the value we had for the aggressive level of the global mesh. So far, for the second level, the mesh size is reduced to 38 mm.
We have two ways of changing global mesh fidelity: either going through standard, aggressive, or extreme approaches or changing the custom level from 1 to 2 and 3. If you check the sizes for the meshing here in this model, they are almost 55, 56 for standard.
For the extreme global fidelity, the mesh size is 33, 34, and now for level 3, we have a little bit larger size, 37 mm.
Generally, for either changing the scheme for the global mesh fidelity in Explorer mode or increasing the custom level of the machine fidelity in global fidelity, the effect of mesh impact shows here on max velocity on the left and max temperature on the right.
In Explorer mode, if you check the range, you can see that the difference between the velocities for different meshes is again enough, about 5%. We almost have the same and close max temperature.
In this video, I showed you how to change the mesh fidelity in Explorer mode, either from a sliding bar that we can change the mesh size here or through the global mesh fidelity that I can choose the scheme for them or the approach for the global fidelity from a standard, aggressive, or extreme or working on the level of the custom for the machine.
Another one is local fidelity, which I will talk about when showing you the machine in refine mode. Thank you very much.
