Supply Chain Volatility – Aerospace Manufacturing and Design

Ahhh, Thanksgiving, a day meant to gather with loved ones to remember all the good things in our lives. Unfortunately, Thanksgiving is not without its dangers, but fear not, Computational Fluid Design (CFD) is here to help. CFD can help you cook your turkey even on supersonic to reach a safe 160°F. Traveling to get to a Thanksgiving meeting? Make sure your car is aerodynamically optimized with CFD. Oh you do, then maintain the perfect temperature in all rooms of your home by balancing your heating and air conditioning system with CFD!

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Figure 1

Yes, I see the problem. The turkey is cooked and looks great. All guests arrived safely. Everyone is ready to sit down at the table. Your sister has invited her relatives to join, and one of them (let’s call them “X”) takes some extreme political positions and likes to talk about them to anyone and everyone. If that were the only problem, figuring out where to sit would be easy: as far away from X as possible. But no, your cousin who just named himself “Z” will also be making his way through dinner. Now the problem is more complicated. Where do you sit to avoid the hot air filled with either political conspiracy theories or the benefits of the latest fad diet?

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Figure 2

As the host, you can assign seating at a table, such as the one shown in Figure 1 (above). Where do you sit to be least affected by the hot air generated by X and Z? Worse, you only have time to set up and run one model!

ANSYS Workbench’s parametric analysis capabilities allow you to set up tens or hundreds of analysis design points and run all of them. The solution can store complete results for each design point, or you can define only the output parameters that are important to your process. Solving several hundred analyzes can take a long time, so simplifying the task becomes extremely important. In this case, reducing the 3D volume to a blue 2D surface is enough to solve the problem.

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Figure 3

Breathing rate and temperature are set for each seat by default to reasonable values. The speed and temperature values ​​then increase for both X and Z, with X having a higher speed (obviously, but not as annoying) and Z having a higher temperature (not as strong, but annoying over time). A table of 131 design points displays all possible seating positions for X and Z. To complete the solution set, all you need to do is update all design points and capture the temperature at each head surface as output parameters for each analysis.

Individually, the speed results are as you might expect. The unfortunate soul, Cousin Jim, sitting in position 10, directly in the path of X, is thrown into the air at high speed, as shown in Figure 2 above.

However, due to mixing and diffusion, Jim does not overheat, as their own breath carries away most of the heat. Unfortunately, Aunt Edith in position 3 becomes blindsided by a stream of raw hatred from Z after Grandpa (obviously in position 1) deflects the flow.

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Figure 4

The compilation of results shows some interesting trends that allow you to avoid getting hot air. First, suppose we are neither X nor Z. Under these conditions, the average temperatures for all seats produce the lowest temperatures in positions 4 and 10. The highest temperatures are in positions 2, 4, 8, and 12. So that settles it, right? Sit as close to the middle of the table as possible and breathe, as even breathing can keep you cool even if X or Z is sitting right across from you. This seems like good advice as long as the assumption holds true. A compilation of the results, including the seating positions for X and Z, shows that the temperatures in these seats are generally higher than any others, as shown in Figure 4 right.

The maximum value, regardless of seat location, is the seat occupied by X or Z about 90% of the time. Of the data points above this line, exactly 90% are in locations X or Z. This means you have a 90% chance of avoiding hot air regardless of where you sit at the table; just make sure you’re not the one producing the hot air and you’ll be fine.

Happy Thanksgiving from RandSim!

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