Genius is just the threshold for me!

Chapter 51 CFD Aerodynamic Verification

8:10 the next day.

After finishing breakfast, Lin Dong went downstairs to go to school. Just as he reached the community garden, Xu Qingling walked out of the building next door.

"Lin Dong!"

Xu Qingling called out cheerfully and quickly walked to Lin Dong's side, turning her head to ask, "Did you really acknowledge Uncle Wang as your godfather last night?"

"OK."

Lin Dong smelled the delicate fragrance and faint scent of shower gel emanating from the girl and smiled, "Didn't I reply to your message last night?"

On weekends and during winter and summer vacations, Xu Ziming and Zhou Xiaoyan were more lenient with Xu Qingling. They wouldn't say anything if she came to Lin Dong's place and stayed until 10 or 11 p.m. before going back.

But during the regular school weekdays (Monday to Friday), I have to go to bed before 10 p.m. because I have to get up around 7 a.m. the next day.

They returned from Wang Xingguo's place last night, after 9 p.m.

At that time, Xu Qingling had been confined to her home by Zhou Xiaoyan, and all she could do was send a message saying she would come to see him later.

"From Monday to Friday, my mom takes my phone away at nine o'clock every night, and I can only play with it after school in the afternoon." Xu Qingling pouted and said aggrievedly, "I didn't even know you replied to the message."

"Who told you to secretly play on your phone until midnight as soon as you got it?" Lin Dong couldn't help but laugh. "And you even played with the lights off."

"I wasn't just happy for a moment. I chatted with you until late, but Mom only punished me. Aunt Xia didn't punish you." Xu Qingling felt even more aggrieved now.

Lin Dong was talking about how she had just gotten access to a cell phone at the end of last year. During the first week, she was so excited that she chatted with Lin Dong until midnight, and then Zhou Xiaoyan caught her and started limiting her usage time.

"I'm not like you."

Lin Dong laughed and said, "I played with the lights on; dim light isn't less harmful to the eyes."

"..."

Xu Qingling muttered to herself, "If I dare to turn on the light and play on my phone at school, Comrade Zhou Xiaoyan will come rushing over the moment she sees the light coming through the crack in the door."

"Oh, right."

At this moment, Xu Qingling seemed to have thought of something and leaned closer, whispering as if biting a mosquito, "Lin Dong, is there any special project at Chengdu Aircraft Industry Group lately? My dad is going to be sent on a business trip?"

"A special project? A business trip?"

Lin Dong paused for a moment, then shook his head and said, "This has nothing to do with Uncle Xu."

What's particularly special about Chengdu Aircraft Industry Group right now is the Emei engine project brought over by the 606 and 624 engines.

However, this project is still in the research and development design and verification stage, and has not yet reached the actual verification step, so it has little to do with Xu Ziming, who is in charge of manufacturing and process.

"This morning, it seems Uncle Wang assigned him a project. I saw him digging out books and papers he read more than ten years ago. He seems to be very busy," Xu Qingling said, expressing her doubts.

"Materials books?"

Lin Dong paused, asking curiously, "Uncle Xu, did you study materials science before?"

"Yes, he has a double doctorate in manufacturing engineering and materials science."

Xu Qingling nodded: "I heard my mom say before that my dad originally planned to stay at the research institute in Beijing, but my grandma got sick at that time, and my mom had to come back to take care of her, so he came to Chengdu with her and joined Chengdu Aircraft Industry Group as an engineer."

"so……"

Lin Dong seemed to have thought of something, and his expression turned somewhat strange: "Uncle Xu probably has something to arrange, but it shouldn't be a business trip. He might just be a little busy from now on."

"It's not a business trip, as long as I can be home often, that's fine." Xu Qingling was relieved.

She still has a good relationship with her father, so if Xu Ziming were suddenly assigned to a business trip, he would really feel uncomfortable and unhappy.

After all, research and development work in the military industry sometimes means being out of contact for a period of time when traveling, which is completely different from regular business trips where you can stay in touch every day.

Soon, the two arrived at the school.

A simple day of campus life has passed.

In the afternoon, Lin Dong and Xu Qingling went back to the family compound, but instead of going in together, they went around the compound and arrived at Laboratory No. 78.

Di-

Lin Dong entered the laboratory, opened the supercomputer remote access to his home computer, and downloaded the relevant drawings and data of the multi-axis drone he had designed over the past two days.

Compared to the previously strictly confidential Hot Hot, the hardware blueprints for the multi-rotor drone are almost publicly available, and it does not require operation entirely offline.

After downloading the drawings, Lin Dong opened them, imported the relevant data into the CFD simulation software, and began simulation analysis.

CFD is short for Computational Fluid Dynamics.

This refers to a technique that uses computers to solve the fluid flow control equations and perform simulation analysis of fluid flow.

In layman's terms, this thing uses computers to simulate atmospheric flow, which can help verify the optimal aerodynamic layout for an aircraft during flight.

boom--

The supercomputer's cooling fans roared.

One by one, data points verified by CFD emerged.

"The blade angle is 0.1° too large, the blade size is increased by 0.14 cm, the length is reduced by 1.23 cm, and the support distance is shortened by 3.14 cm..."

Lin Dong glanced at the data, changed the drone's parameters, and then restarted the simulation calculation.

Although when he first started designing the Hot 001 machine, there were no supercomputers at that time, and Lin Dong completed all the data verification of the aerodynamic layout using only his brain.

But times have changed, and the ability to make good use of tools is humanity's greatest advantage.

If you rely on your own brain to calculate, even if the aerodynamic layout of a multi-rotor drone is several orders of magnitude simpler, to ensure that you have enough mental energy so that you don't become listless and get stared at by Zhang Xiali due to excessive mental exertion, this workload would take at least four days of your spare time.

With the help of this supercomputer, the verification work can be completed in just two hours.

He only needs to input the parameters and aerodynamic formulas of the multi-rotor drone, let the supercomputer complete the tedious intermediate verification process, and then complete the next step of optimization based on the supercomputer's verification results, and input the optimized parameters again for verification...

"The verification process is a mechanical task. The key is how to use the data obtained from the verification to further optimize the aerodynamic design."

"The electric propellers of multi-rotor drones, as well as helicopter propellers, can be regarded in a sense as an infinite bypass aircraft engine, one without boundaries, without a shell, with the entire sky as its bypass duct."

"However, this bypass duct has no boundaries, but the aerodynamic effect of the propeller does have boundaries."

"There is a clear dividing line between how far the air stirred up by the propeller can reach and how much impact it can have in a certain period of time."

Lin Dong's mind raced with thoughts, but his hands never stopped moving. Every time the data was verified, he would start inputting new optimization parameters the instant they were processed.

A propeller-driven aircraft engine has no outer casing, which is equivalent to an unbounded bypass duct, allowing the rotating blades to carry more gas.

According to Newton's second law, the amount of gas propelled generates the same amount of thrust, making propeller engines significantly more efficient than any jet engine.

However, because there is no pressure constraint from the ducted casing, the propeller's efficiency drops sharply when the tip approaches the speed of sound.

This also determines that the speed limit of propeller-driven aircraft is usually Mach 0.6, and the maximum speed does not exceed Mach 0.72.

"Last group, done!"

Once the sun had moved to the top of the western mountain, Lin Dong finished verifying the last set of data, printed out the drawings and went to the workbench next to him, and then took out several large pieces of PEEK special engineering plastic and a series of processing tools.