Discover the Lagrangian for 2D Vortices | Essential Homework Equations

In summary, the conversation is about finding the Lagrangian for 2D vortices and the clarification that a Lagrangian is not specifically for 2D vortices, but for systems in general. The conversation also mentions the possibility of finding vortices in systems and suggests asking the question more accurately.
  • #1
Alireza383
1
0

Homework Statement



Hello,
Do you know how to find Lagrangian for 2D Vortices?

Homework Equations

The Attempt at a Solution

 
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  • #2
Welcome to the forum.

You are going to want to read the notes on here about how to post. Because you are posting in a homework help forum you need to follow certain rules.

A vortex is a solution to equations of motion. A Lagrangian is a way of expressing the equations of motion for a particular system. That is, you are putting things a bit out of order. A Lagrangian is not "for 2D vortices." It is the Lagrangian of a certain system, and some systems happen to have vortex solutions.

Maybe you meant: Can we name a system that exhibits vortices? And what is the Lagrangian for that system? And how can one calculate a vortex in that system?

First part is easy, if you count a smoke ring as a vortex.



For the rest, you should go back and ask your question correctly.
 

1. What is a Lagrangian in physics?

A Lagrangian is a mathematical function used in classical mechanics to describe the dynamics of a system. It is derived from the system's kinetic and potential energy and is used to determine the equations of motion for the system.

2. How is the Lagrangian for 2D vortices derived?

The Lagrangian for 2D vortices is derived by using the concept of vorticity, which is a measure of the local rotation of a fluid. The Lagrangian is then obtained by integrating the vorticity over the entire fluid domain.

3. What are the essential homework equations for the Lagrangian of 2D vortices?

The essential homework equations for the Lagrangian of 2D vortices include the vorticity equation, the stream function, and the Bernoulli equation. These equations are used to derive the Lagrangian and to solve for the motion of the vortices.

4. What is the significance of the Lagrangian for 2D vortices?

The Lagrangian for 2D vortices is significant because it allows us to study the behavior of vortices in a fluid in a simplified manner. It also helps us to understand the motion and interactions of vortices, which are important in many natural phenomena.

5. How is the Lagrangian for 2D vortices used in practical applications?

The Lagrangian for 2D vortices is used in practical applications such as studying the motion of particles in a fluid, understanding the behavior of hurricanes and tornadoes, and designing more efficient aircraft and propellers. It also has applications in oceanography, meteorology, and astrophysics.

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