Chapter 59: This wing still has room for improvement

In the past, their digital design team could not even catch up with the project progress and was falling further and further behind. But today, in just one afternoon, Chang Haonan has already directly started to look for the design problems of the 83rd Project and considered ways to improve it?

This feeling is as if the student with the worst grades in the class suddenly came first in the exam and had to give a lecture to the top students in the class.

It was almost like a dream.

In fact, the reason why Chang Haonan was so confident was naturally because he knew that this problem existed in the August 8rd Project, and also knew that when he later designed the J-F, some small changes were made to the wings to adapt to the size and A heavier air-to-ground weapon.

But this time, he was no longer satisfied with just repeating the improvements made by later generations.

Judging from the situation in the late 8s, the J-90 actually has considerable potential. The People's Air Force also needs an aircraft type to complete high-altitude tactical reconnaissance and interception missions.

Of course, in the original timeline, the level of China's aviation industry was still relatively low at this time. Later, when it developed enough to continue tapping the potential of the J-8F, it was already around 2010, which was indeed a bit late.

But there is still a chance for Chang Haonan, who has returned to 1996!

"Um...is there anything we can do to help?"

Lin Shikuan asked weakly from the side.

If what Chang Haonan said is true, then this is an excellent opportunity for the entire digital design team to make a comeback.

Even if it turns out that the other party's worries are unfounded, there will be no problem.

There's nothing to lose anyway.

When this group was first established at the beginning of last year, because it did not require frequent trips to the workshop and climbing up and down to draw drawings by hand, it became a hot topic for a period of time. As the group leader, Lin Shikuan could even get one from every meeting. Front row seats.

But as time went by, their status, which had never been able to produce convincing results, was gradually declining, and Lin Shikuan himself was embarrassed to sit in the front.

Until recently, he would sit in a corner during meetings for fear of being called on by the leader in front of him.

Just like a graduate student whose progress is not optimistic during a group meeting.

"help……"

Chang Haonan didn't expect what he needed, but after two clicks of the mouse, he found that the system's pointer style had changed from a familiar pointer to a small rotating funnel.

Before Windows 7, this cursor indicated that the system was busy and the user should wait.

"Do you have any better computers here, such as workstations or servers?"

"There are two SUN workstations, but we usually only use them when performing complex calculations." Lin Shikuan replied.

"SUN...is a UNIX system?"

In the second half of the 90s, with the continuous development of Windows NT and Linux systems, Unix has shown signs of gradual decline, but after all, it has advantages in security and stability, so it still has a fairly high stock.

Of course, simulation software such as Fluent and Nastran can also be run in a Unix environment. Even for a long time, full-featured Fluent could only run on Unix.

But Chang Haonan is not skilled in this.

"It's Unix. We have an operating manual, but it's still very troublesome to use."

"No, please take me there." Chang Haonan pulled out the floppy disk from the computer.

"Can you still use Unix?"

Yao Mengna's eyes flashed with curiosity next to her.

"I have studied some open source Linux systems, so there should be no problem in operation."

"If I hadn't seen your student ID card before, I couldn't believe you were only in your twenties." Yao Mengna shook her head and sighed: "Sometimes I wonder if you have 48 hours a day, otherwise how could you learn So many things?”

"It mainly depends on reasonable arrangement of time, and of course maybe a little bit of luck."

While Chang Haonan was talking, he quietly spent 5 points in the system to start a new project.

[Carry out aerodynamic derivative and flight load analysis on the J-8 aircraft with bombs in the Unix environment, and study the impact of parameters such as aerodynamic type, flight dynamic pressure and angle of attack on the rudder control efficiency]

In an instant, a large amount of knowledge about the Unix environment poured into Chang Haonan's mind. Fortunately, he already knew the content related to aerodynamic simulation, so he did not find it too difficult to bear.

At this time, Lin Shikuan, who was leading the way, suddenly asked in a slightly curious tone: "I know Linux, but what does open source mean?"

After hearing this question, Chang Haonan realized that the concept of open source was only officially born in 1998.

"Uh...it means free. After all, Unix requires a fee and is very expensive. It is impossible for computers in ordinary places to install this kind of system." Chang Haonan was not a programmer in his previous life. He didn't know much about the details of these definitions, so he casually responded. passed.

Fortunately, at this time, the three people also came to the room with the workstation next door. Lin Shikuan seemed to want to ask something else, but in the end he did not ask. He just walked forward and turned on the power of the workstation with unskilled movements. .

As an operating system based on the command line, no one had developed beautiful graphical interfaces for Unix and Linux in the 90s. Therefore, after turning on the workstation, what greeted Chang Haonan's eyes was a monotonous command line interface.

However, with the help of the system, although Chang Haonan actually saw Unix for the first time, he was able to use it with ease.

Although this is not the first time I have experienced this, this feeling...

fantastic.

Although Lin Shikuan and his colleagues have been working in the wrong direction for the past year and a half, they are definitely not scratching the surface. They modeled the structure of the J-8-3 aircraft wing very carefully, saving Chang Haonan a lot of effort.

The native version of fluent in the Unix environment has a GAMBIT pre-processing software specifically used for meshing, which allows it to skip the extremely long and boring meshing process to a certain extent and determine the mesh around the wing. The calculation starts directly after the flow field model.

Yao Mengna looked at Chang Haonan who was operating the workstation, and felt as if she had returned to the afternoon when the two met for the first time.

"Lin Gong, when we came here in the morning, Mr. Yang said that our institute will have a project progress seminar tomorrow night. Is this something that all teams of the 83rd Project must participate in?"

After a while, Chang Haonan looked at the program being calculated in front of him and turned back to Lin Shikuan, who had been watching from behind.

"Yes, this is the largest meeting of the entire project team once a month."

When this matter was mentioned, Lin Shikuan's expression quickly fell: "Not only do each group have to send people to participate, but they also have to report on their work progress."

Obviously, for him in the past, this kind of time was basically equivalent to a public execution.

"Well...that's good." Chang Haonan stood up from the chair and stretched his muscles: "Then when it comes to the meeting, can I speak on behalf of the digital design team?"