Chapter 241 (2/2)

”But it doesn't matter. You are only a freshman, and the knowledge reserve is obviously not enough. You don't need to be able to understand this subject. The difficult ones, give us three. You just need to give us a hand. ”

”I'm here. I promise to take you and fly with you!” Wang Ji clapped his chest and pretended to be full of breath to say this sentence.

”Foundation, don't talk nonsense, you talk quickly. Then we assign the task and it's over. ” Jiang Shuobo helped his glasses and urged him.

”All right, now, now!” Wang Ji controls the mouse and opens a word document.

He coughed and opened his mouth slowly. ”Our project, in fact, is to use the compact difference scheme to discretize the two-dimensional Helmholtz equation. The difference scheme has the characteristics of sixth order accuracy, three-point difference and implicit

In the middle of the sermon, Wang Ji seemed to suddenly think of something. He asked Cheng Nuo, ”you should know what Helmholtz equation and compact difference scheme are, don't you?”? These two nouns seem to have no contact with each other

”However, since Mr. Liao asked you to join our research group, it should not be a problem for you?” Wang Ji looks at Cheng Nuo with a smile.

”Helmholtz equation and compact difference scheme?” Cheng Nuo scratched his head and said modestly, ”I've heard a little.”

”Oh?” Wang Ji's eyes brightened, reaching for Cheng Nuo, ”that Cheng Nuo's younger brother, tell me your understanding. Just take advantage of this opportunity, the elder will give you something you have missed. You can understand these two terms thoroughlyIn Wang Ji's opinion, with Cheng Nuo's freshman education, it is not easy to know these two terms which are obviously beyond the class. I guess I heard it by accident. In the end, it's not up to you to explain it yourself.

Just in time, Wang Ji plans to take advantage of this opportunity to build up the prestige of a senior student in Cheng Nuo's mind.

”Thank you very much. Please Cheng Nuo's tone is sincere.

”Oh, no trouble, no trouble.” With Cheng Nuo's praise, Wang Ji waved his hand and laughed triumphantly, ”it's our duty to guide students to learn. You can say it boldly, even if you say it wrong, it doesn't matter! ”

Cheng nodded. ”Let me first talk about the Helmholtz equation, which was named after Helmholtz, a German physicist. It refers to the hyperbolic partial differential equation with (△ 2 + K2) ψ = f in mathematics Where △ 2 is the Laplace operator, Helmholtz equation in rectangular coordinate system, ψ is the function to be solved, K2 is a constant, and F is the source function. When f is equal to zero, it is called homogeneous Helmholtz equation; when f is not equal to zero, it is called nonhomogeneous Helmholtz equation... ”

Cheng Nuo talks with a lot of words When a function f (x, y, Z, t) changes harmoniously with time, it can be expressed in the form of F (x, y, z) ejwt. In this case, дддддддддддддддддддддд

From the source of Helmholtz equation, formula, solution, transformation, application, Cheng Nuo can be said to be all-round, every place said meticulous, can not pick out any mistakes.

Just for the term Helmholtz equation, Cheng has been talking about it for more than ten minutes. What he said is that there is a tendency of saliva flying and cadence, and it has not stopped until now.

Wang Ji, who is sitting opposite Cheng Nuo, has grown up incredibly at this time.

Have you heard anything about it?

I especially believe in your evil, will believe your lies.

It's called a little bit of hearing, so what are we?

This guy, is there any misunderstanding about this word?