The Military-industrial Scientific Research System of the Academic Master Chapter 3

Chapter 3 Are all undergraduates so good these days?

"That's okay, then you can take note of it." Chang Haonan didn't think much and continued to type on the keyboard without looking back. At this moment, his work also entered the final part.

Yao Mengna didn't care about anything else at this time, and quickly took out a pen and notebook to record. However, Chang Haonan, who had the most contemptuous attitude in the world, made the other three people dumbfounded -

Is this the real boss?

Teach a second-year PhD student directly as a second-year undergraduate student?

Wu Yifan suddenly regretted that he had not studied hard in the past three years.

After writing the last line of code, Chang Haonan pressed the middle button of the mouse and dragged the programming interface back to the top. His programming format was very standardized, and he did not write comments just to save time. In addition, the code was not too much. So it is very simple to talk about.

“Considering the limitations of computer performance and the symmetry of the model, half the model is used for calculations to save resources.”

“The mesh near the wall can locally increase the density...”

“The inviscid flux adopts the second-order Up-wind Roe-FDS format…”

“The turbulence model adopts the k-ωSST two-equation model. Taking into account the high temperature effect of the gas, the thermal complete gas model considering variable specific heat is used in the calculation..."

“The molecular viscosity is calculated using Sutherland's formula, adiabatic no-slip and solid boundary conditions are adopted for the wall surface, and pressure far field and pressure outlet boundary conditions are adopted for the inlet and outlet respectively.”

“When each residual indicator decreases by at least two orders of magnitude and the export flow basically remains unchanged, the calculation can be considered to have converged…”

After spending a lot of time explaining his simulation ideas, Chang Haonan directly mobilized the program to start calculations for the modeling he had just done, and almost habitually said to Yao Mengna, who was still writing fast: "Specific programming statements and grids I won't talk about the division operation. People who have studied in graduate schools should know it. ”

Yao Mengna raised her head in confusion.

Chang Haonan's words simply stopped her.

What does “people who have studied as graduate students should be able to do”? How can anyone teach me this kind of thing step by step now? I almost always figure it out myself, okay?

And am I a graduate student or are you a graduate student?

Okay, Yao Mengna admits that the undergraduate student in front of her is indeed a bit better than herself in simulation...

I'm so angry, but there's nothing I can do.

But...is this really something that undergraduates can do?

Her eyes glanced at the student ID card that Chang Haonan placed next to the keyboard.

is the color of undergraduate students.

She even quietly opened the outer page of her student ID card to check it.

Chang Haonan, Class 9302, Department of Aircraft, School of Aeronautical Science and Engineering, Beijing University of Aeronautics and Astronautics, is a junior this year.

But...how is this possible? Putting aside computational fluid dynamics, even writing code itself is not that easy.

Most students only started to learn about "computer" after entering their freshman year. Considering that they only have up to one hour of operating time per day, very few can perform simple programming.

unless…

Unless he has been exposed to these things before going to college.

Yao Mengna was obviously not the only one who had such thoughts. Zhang Man on the other side looked at Chang Haonan and his eyes gradually changed.

You need to know who were the people who could buy a computer at home in the mid-1990s?

Let's not say you have to be rich or noble, at least you have to have something.

In fact, Chang Haonan had realized that his attitude just now seemed a bit wrong, but looking at Yao Mengna not far behind him, he really didn't know what to say about it. So I had to stay silent and let this matter pass as soon as possible.

Fortunately, the awkward atmosphere did not last long.

"It's already dinner time. I'll buy food for you." Zhang Man looked at the clock on the wall and offered to help with errands: "Senior sister, do you want one too?"

Before Yao Mengna could answer, Zhou Shuwan stood up next to him: "I'd better go. It's quite far from the canteen, and my pace is faster."

This sentence made Chang Haonan, who had completed the programming and was just waiting for the computer to run the results, shake his head helplessly. Zhou Shuwan did have true feelings for Zhang Man, but the latter...

Neither agreed nor refused, so he was hung up for four years.

Chang Haonan is not sure what happened next, but the two people must not have gotten together, because Zhou Shuwan, like himself, was still unmarried more than 20 years later.

In short, licking a dog will not end well.

Don't get me wrong, Chang Haonan has never been a licker. He was just focused on work when he just graduated. Later, he became somewhat successful at work, got older, and traveled all day on business, so...

Of course, he will not be stupid enough to directly stop the other person from doing anything. A person who is immersed in love will not realize that he is being played like a monkey. On the contrary, he who is trying to dissuade is likely to be in trouble.

Let's wait until we have the opportunity to make some insinuations. If we still don't understand, we can only respect and bless it.

In the end, Zhou Shuwan couldn't defeat Zhang Man and made the latter trot to the canteen to buy food.

"Strange...she usually asks me to go, what happened today..." Zhou Shuwan muttered with some confusion as he looked at Zhang Man's leaving figure.

"Uh..." Wu Yifan, who had seen a similar situation for the first time, put his hand on his forehead and sighed.

“What's wrong?”

Zhou Shuwan heard Wu Yifan sigh and thought there was something wrong with Chang Haonan's simulation, so he quickly came over, but the screen seemed to be similar to before, with a bunch of codes and data that he couldn't quite understand.

At this time, even Yao Mengna, who was originally looking like a loser, couldn't help but raise her head and glance at Zhou Shuwan with hopeless eyes, and then showed an expression of an unteachable child.

In fact, the workload of this simulation is not large. Chang Haonan's purpose is just to calculate the original performance of the MiG-21, especially the total pressure recovery coefficient of the inlet under several typical working conditions, and the wing at different altitudes. And the lift coefficient under the angle of attack and the control efficiency of several rudder surfaces, and then make the body model.

After all, according to his plan, no changes will be made to the rear fuselage of the aircraft. It will be used directly when the time comes.

And considering the limitations of hardware performance, he only asked the system to output the performance parameters of a few design points, and did not directly run the flow field curve as he was used to before rebirth.

However, despite this, by the time Zhang Man bought the rice, the calculation was still only partially completed.

“What are these... parameters?”

Zhang Man distributed a foam lunch box and disposable tableware to everyone from the bag in his hand, while looking at the screen in front of Chang Haonan with wide eyes.

As a student majoring in Beijing Airlines' ace major, Zhang Man could understand what these results probably represented, although she had not followed Chang Haonan's idea of simulating it just now, but she still asked with curiosity and admiration.

"Well, the static pressure distribution at specific points on the inlet wall under different airspeeds and angles of attack, the Mach number distribution at typical positions of the axial interface, and the drag coefficient at different incoming flow Mach numbers can be calculated. The average total pressure recovery coefficient of the airway, as well as the total pressure distortion.

In addition, if you make these data into charts, you can also draw the flow field structure at the design point. Of course, the calculation is only more than halfway done now, so you have to wait. "

After Chang Haonan finished speaking, he stood up with the lunch box in his hand and prepared to go to the empty classroom next to him to eat - letting Zhang Man bring the lunch box into this building was probably the limit of the management teacher. If the latter could see five people Sitting in front of the computer to eat, I'm afraid my blood pressure will explode and I will faint.

(End of this chapter)

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