Chapter 3 Are all current undergraduates so good?

"Okay, then you can remember it." Chang Haonan didn't think much and continued to type on the keyboard without looking back. At this time, his work had 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, but Chang Haonan, who had the most contemptuous attitude in the world, made the other three people dumbfounded——

Is this the real boss?

Directly teach a second-year PhD student 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 was 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 kw SST 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. The adiabatic no-slip and solid boundary conditions are adopted for the wall surface, and the pressure far field and pressure outlet boundary conditions are adopted for the inlet and outlet respectively."

"When each residual indicator drops by at least two orders of magnitude and the outlet flow rate remains basically 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 be able to do it.”

"???"

Yao Mengna raised her head in confusion.

Chang Haonan's words immediately stopped her.

What does 'people who have gone to graduate school should know'? 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?

Well, Yao Mengna admitted that the undergraduate student in front of her was indeed a little bit better than herself in simulation...

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

But...is this really something an undergraduate can do?

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

It's the color of undergraduate students.

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

The vast majority of students only began to learn about "computers" after entering their freshman year. Considering that they only have one hour of operating time per day at most, 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 also gradually changed his eyes when looking at Chang Haonan.

You want to know who could buy a computer at home in the mid-90s?

Not to mention either rich or noble, at least you have to have something.

In fact, Chang Haonan had already 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 no choice but to remain 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 run errands: "Senior, 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. My feet are 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 agreeing nor refusing, he was hung up like this 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 bitch. He was just focused on work when he first graduated. Later, he got a bit 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, the person who tries to dissuade someone, is likely to end up in trouble.

Wait until you have the opportunity to make some insinuations. If you still don't understand, then you can only respect and wish me well.

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

"It's 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 was not seeing 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 a hopeless look, 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 meal, only part of the calculation was 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 Jinghang's ace major, Zhang Man could still 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 these data are made into charts, the flow field structure of the design point can also be drawn. Of course, the calculation is only more than half done now, so we 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 saw five If you sit around the computer and eat, your blood pressure will explode and you may faint.