Riding the wind of rebirth

"Yes, if this thing is used on a rocket, it can increase the heat flow of the gas to seven to eight times the speed of sound, thus generating a huge thrust."

"This is the Laval nozzle, which actually acts as a 'flow rate amplifier'. Not only rocket engines, but also missile nozzles are in this trumpet shape, so the Laval nozzle has a very wide range of applications in weapons."

"Does this have anything to do with Xiaomiao's research?" Zhou Zhi asked modestly.

"Fluids have commonalities." Qin Haifeng smiled and said, "Although our model is mainly used for water flow simulation, it is used to simulate the cavitation caused by the low pressure caused by the Venturi effect when the fluid moves at high speed, and simulate the movement trajectory of these cavitations and their effects on the metal surface. It belongs to the application category of overcoming damage, but with a slight change in parameters, it can also be applied in the direction of obtaining gain."

"The Xichang base was inevitably jealous of our good use of the model. They just happened to hear that you were going to launch a satellite first and thought that the parties could start cooperation, so they called us to this meeting as well."

"But this is the research institute of the Ninth Academy?" Zhou Zhi was still a little confused: "The Ninth Academy doesn't have any research tasks related to rockets and satellites, right?"

"In fact, we have also been doing computer particle motion simulations." Sun Liangdong said, "However, due to the limitations of resources and previous academic routes, we have always taken the path of linear calculations."

"I heard that you have made considerable breakthroughs in nonlinear simulation and have applied it reliably in the Ship Research Institute. I would like to invite you to give us a lesson." Sun Liangdong said: "As for whether the 9th Institute has any relationship with rockets and satellites, can our products be separated from the rocket carrier? We are all a family connected by flesh and blood!"

This is absolutely true. How did they launch the two bombs and one satellite? They are really a family.

"Don't worry, Grandpa Sun. Grandpa has already told me. I have already made a report on the latest progress of our computing power matrix principle and nonlinear basic model. As for the high-speed fluid cavitation simulation research, I may have to trouble Brother Gu, Brother Yao, Sister Zhang and others."

"Xiao Miao was talking about several comrades in our Shudu project team." Qin Haifeng quickly explained: "Clover provided us with a computing black box. The fluid cavitation modelers did extended research based on Xiao Miao's nonlinear model."

"Xiao Miao is doing basic research. He can guide us from a mathematical perspective, but it is a bit far from these specific applications. We need several comrades to participate in rocket high-speed gas propulsion and particle impact simulation."

"Seeing the energy and enthusiasm of you young people reminds me of the energy I had in the desert back then." Sun Liangdong said with a smile: "The country is full of talented people, and each of them leads the way for hundreds of years. The future of academic research depends on you!"

The dinner at the guesthouse was quite sumptuous. The chefs here cooked Shandong cuisine. Sun Liangdong played the role of host and treated Mai Xiaomiao and Zhou Zhi to a meal.

Although there was no scallion-fried sea cucumber, the stir-fried beef with scallions was so crispy and fragrant yet so tender that Zhou Zhi couldn't help but marvel at the praise.

After dinner, they arranged to rest. Zhou Zhi and Mai Xiaomiao's rooms were adjacent, so after putting their things away, they stuck together again and slipped downstairs for a walk.

The institute also has exercise facilities such as basketball courts, badminton courts, and parallel bars, surrounding a small stadium. There was nothing to see, so the two of them simply circled along the large wall.

"I didn't know you were working so hard during this period." Zhou Zhi quietly pulled Mai Xiaomiao's hand and said, "If you have any extra tasks in the future, tell me and I will adjust the progress of the project."

"I'm not tired." Mai Xiaomiao smiled and said, "You just made it too easy for me. I'm a little uncomfortable. I didn't tell you until I received the task from Uncle Qin."

"These are all big things..." Zhou Zhi rubbed Mai Xiaomiao's palm: "Since you have already accepted it, then do your best to complete it. But if you feel any pressure, you must tell me and I will go to coordinate with them."

"Well," Mai Xiaomiao also squeezed Zhou Zhi's hand: "You're not angry, are you?" "I'm angry, very seriously." Zhou Zhi pretended to be gloomy in the dark: "In the future, if you want to increase the workload, you must let me know first."

"Okay." Mai Xiaomiao secretly kissed Zhou Zhi in the dark: "This is an apology."

"You can't be so perfunctory when you apologize..." Zhou Zhi hugged Mai Xiaomiao for a long time before letting her go: "You have to be sincere this way."

"Well... Elbow, you bad guy, carry me back!" Mai Xiaomiao was made weak by Zhou Zhi.

"Look how sincere I am..." Zhou Zhi was still grinning, and then he was hit by a soft punch from Mai Xiaomiao.

Although Zhou Zhi felt sorry for Mai Xiaomiao, he was actually very proud of her. After the basic model of nonlinear simulation was successfully polished, high-end simulation applications could be built on it.

This is just as important as the improvement in aircraft manufacturing brought about by a country's possession of a giant wind tunnel. With a nonlinear model, many physical phenomena with nonlinear properties can be simulated.

For example, the design of a rocket nozzle involves parameters such as flow rate, flow velocity, temperature, and nozzle design as well as the design of a dynamic adjustment system. If all experimental designs were adopted, the amount of material burned alone would be an astronomical figure that would be unbearable.

Computer simulation is great. It not only saves money, but also saves a lot of time. Preparing experiments on the computer is just a matter of changing parameters and designing models by typing on the keyboard, which is much more efficient than calling materials to prepare experiments.

Moreover, once the model is built, it can be used repeatedly. For example, the fluid model developed by the Ship Design Institute can convert liquid properties into gas properties by adjusting the relevant coefficients such as fluid density, damping, and temperature. By adjusting the flow rate, flow rate and environmental structure, it can convert overcoming water flow resistance into generating airflow thrust.

As for the collision simulation example mentioned by Sun Liangdong, it is even more exaggerated. When talking about this in the research institute affiliated to the Ninth Academy, it is hard not to think of nuclear fusion and nuclear fission.

While chatting at the dinner table today, Zhou Zhi learned that the U.S. Department of Energy had initially used $192 billion to build a "National Ignition Facility" that used high-power lasers to generate megajoules of pulse energy for research on the physical laws of nuclear reactions.

With the development of technology today, several countries including the United States, Russia, Britain, France, China and Japan have the ability to simulate nuclear tests with computers. However, all countries without exception use the "linear + supercomputing" method, that is, using supercomputers with an extremely high number of calculations to use linear programs to simulate nonlinear nuclear reaction laws.

To put it simply, it means piling up equipment and piling up performance.

Using linear models to solve nonlinear problems is as difficult as using crude mathematical tools to solve advanced mathematical problems. It is like the ancients using counting rods to solve the problem of taking arbitrary square roots. The amount of calculation is very terrifying.

Mai Xiaomiao's design idea is similar to that of primary school students doing Olympiad mathematics, which takes advantage of the thinking.

We can still solve complex problems by using simple foundations and clever algorithm design without stacking massive amounts of calculations.

This is a qualitative leap and improvement, and if things go well, it may even lead to a wave of "overtaking on a curve". So although Zhou Zhi was afraid that Mai Xiaomiao would get tired, he did not dare to stop her from getting tired rudely.

It’s really confusing... (End of this chapter)