What is Euler equations: Definition and 34 Discussions
In mathematics and physics, many topics are named in honor of Swiss mathematician Leonhard Euler (1707–1783), who made many important discoveries and innovations. Many of these items named after Euler include their own unique function, equation, formula, identity, number (single or sequence), or other mathematical entity. Many of these entities have been given simple and ambiguous names such as Euler's function, Euler's equation, and Euler's formula.
Euler's work touched upon so many fields that he is often the earliest written reference on a given matter. In an effort to avoid naming everything after Euler, some discoveries and theorems are attributed to the first person to have proved them after Euler.
I'm trying to linearize (first order) the Euler's equation for a small perturbation ##\delta##
Starting with ##mna (\frac{\partial}{\partial t} + \frac{\vec{v}}{a} \cdot \nabla ) \vec{u} = - \nabla P - mn \nabla \phi## (1)
##\vec{u} = aH\vec{x(t)} + \vec{v(x,t)}##
Where a is the scale factor...
Hi
The rotating bucket problem with a fluid is well known as a homework. For the fun i wanted to adapt it to the case of a massive non-rotating sphere surrounded by a fluid. However i don't know if the calculations i made are correct or don't make sense at all (even if the result lead to an...
Our thesis can be restated as follows: \exists C_\alpha\in\mathbb R_+ s.t. \forall w\in\mathbb R^2_+
\begin{align*}
\lVert u(t,w)-u(t,w')\rVert^2
\leq C_\alpha^2\lVert w-w'\rVert^{2\alpha}
\end{align*}
where w=(y,z) and \alpha=\beta\gamma.
We get an upper bound for each (squared) component of...
Hello. Could anyone help me with some insight in an extra term appearing in the motion equations of a relativistic fluid? I say extra term, because it's not present on the motion for a test particle, as it follows:
Let's propose Minkowski space-time, the motion equations for a fluid with zero...
Hello I am studying mechanics and I have been reading about having the reference frame fixed at a certain point, body fixed and also the gyro equations.
I an identify the gyro case easily as I am looking for an AAC body which rotates about an axis.
I am confused about the other two cases in...
Hello,
I know it might sound silly but sometimes I get confused.
Let's say I have a gyro-compass and I get 3 equations of torque for the 3 axes.
I am expected to find the equation of motion and two of them are equated with 0.
These are the Euler's dynamics equation with moving reference frame...
I know that
##\vec{v_c}=(\omega_1;-\omega_2;0)×(L;-r;0)=0##
So ##\omega_2=\frac{r\omega_1}{L}##
Then, using the system of coordinates shown in the picture and ##\Sigma M_z## I can find the reaction force in ##C##.
But how can I find the reaction forces on ##A## and ##O##? I mean, what system...
Hi everyone,
I am confused when I apply Euler's equation on the free expansion of an ideal gas.
Consider a free expansion (expansion of gas in vaccum) where the volume is doubled (V->2V)
The classical free expansion of an ideal gas results in increase in entropy by an amount of nR ln(2), a...
α is the second derivative of angle and w is the first derivative
In the free body diagrams the only force on A is the normal force since it is only constrained not to move vertically.
Have I drawn the free body diagram and kinetic diagram correctly?
By relating the accelerations of the...
I have been studying the dynamics of free top from Morin's book. In his book when describing the dynamics,he writes down the equation of motion as shown in screenshot. However,I am not able to understand which term refers to which coordinate system. For eg: Here ##\omega## refers to angular...
Hi,
I am going around in circles, excuse the pun, with phasors, complex exponentials, I&Q and polar form...
1. A cos (ωt+Φ) = Acos(Φ) cos(ωt) - Asin(Φ)sin(ωt)
Right hand side is polar form ... left hand side is in cartesian (rectangular) form via a trignometric identity?
2. But then...
I am using from the following Euler equations :
$$\dfrac{\partial f}{\partial u^{i}}-\dfrac{\text{d}}{\text{d}s}\bigg(\dfrac{\partial f}{\partial u'^{i}}\bigg) =0$$
with function ##f## is equal to :
$$f=g_{ij}\dfrac{\text{d}u^{i}}{\text{d}s}\dfrac{\text{d}u^{j}}{\text{d}s}$$
and we have...
Hello all,
I can understand the mathematics of this phenomena
First, one can solve the Euler equations of motion numerically, using Runge-Kutta and plot the motion.
Also, the path of the angular velocity vector will like on the kinetic energy ellipsoid and the angular momentum vector...
I am not entirely sure how to convert the conservation of mass and momentum equations into the Lagrangian form using the mass coordinate h. The one dimensional Euler equations given by,
\frac{\partial \rho}{\partial t} + u\frac{\partial \rho}{\partial x} + \rho\frac{\partial u}{\partial x} = 0...
Homework Statement
Consider the Earth as a rigid body with moment of inertia I1, I2 and I3. The Earth is symmetric around the z-axis (I1 = I2). Calculate the angular frequency w using the euler equations
Homework EquationsThe Attempt at a Solution
Hello all.
After reading both chapters on rigid body motion both in Kleppner - Kolenkow and Taylor books, I still do not undertand the physical meaning of Euler equations. Let me explain:
In Kleppner - Kolenkow, they claim (page 321 - 322) that in Euler equations, Γ1, Γ2 and Γ3 are the...
"A rigid lamina (i.e. a two dimensional object) has principal moments of inertia about the centre of mass given by ##I_1=u^2-1##, ##I_2=u^2+1##, ##I_3=2u^2##
Choose the initial angular velocity to be ##ω = µN \hat{e_1} + N \hat{e_2}##. Define tan α = ω2/ω1,
which is the angle the component of ω...
Hi,
I'm having trouble with this one.
Homework Statement
Find a particular solution of the second-order homogeneous lineal differential equation
x^2y'' + xy' - y = 0
taking in account that x = 0 is a regular singular point and performing a power series expansion.
Homework...
Is momentum conserved?
I am considering the Euler equations in conservative form and solving the Sod shock tube problem I have written a Godunov finite volume type solver. It solves for density ρ, momentum ρu, and total energy E; therefore, I would expect all of these quantities to be...
Homework Statement The Euler equations for ideal compressible flow are given by
\partial_t v + (v\cdot \nabla)v = g-\frac{1}{\rho}\nabla p \\
\partial_t \rho + \nabla \cdot(\rho v) = 0
In my book these are written in terms of the small-value expansions \rho = \rho_0 + \delta \rho, p = p_0 +...
Hi.
Since these equations are approaching three hundred years old I'm pretty sure someone must have solved them somewhere before. However I have not been able to find any text-books or papers that actually show me how to solve these equations. So I'm wondering if anyone here know where I can...
1. Homework Statement
Linearize the euler equations of fluid motion, write as a single partial differential equation for example the pressure pertubation
Homework Equations
The euler equations of fluid dynamics
The Attempt at a Solution
Not sure how I would be able to do this.
Homework Statement
The speed of light in a medium with index of refraction n is c/n, where c is the speed of light in vacuum. Notice that n ≥1:
Suppose a light ray travels in the xy-plane between (x1; y1) and (x2; y2) in a non-uniform
material so that n(x) is the refractive index of the...
Homework Statement
I've got the 3D Euler equations
\frac{\delta u}{\delta t} + (u\cdot \nabla)u = -\nabla p
\nabla \cdot u = 0
I've been given that the impulse is
\gamma = u + \nabla\phi
Homework Equations
And I need to derive
\frac{D\gamma}{Dt} = -(\nabla u)^T \gamma + \nabla...
Homework Statement
Hi there. I'm not sure if this question corresponds to this subforum, but I think you must be more familiarized with it. The thing is I don't know how to get from:
M_x=(I_0-I)\dot\Psi^2\sin\theta\cos\theta+I_0\dot\Phi\dot\Psi\sin\theta
to...
my book says that it is actually difficult to get the true motion of a body by using these equations because it says that euler equations are written in embedded axis frame ...
what is an embedded axis frame?where is it different from normal frames that i used in before?after solving euler...
Given the Euler equations in two dimensions in a moving reference frame:
\frac{\partial U}{\partial t} + \frac{\partial F\left(U\right)}{\partial x} = 0
U = \left(\rho , \rho u , \rho v , \rho e \right)
F\left(U\right) = \left(\left(1-h\right)\rho u , \left(1-h\right)\rho u^2...
Every textbook i find breezes over the following point:
\delta\partial (x) =\partial \delta (x)
where delta is just the variation. Someone asked me why that's true and i guessed the only thing i could say was that delta is an operation not a variable so this is more like an algebraric...
Is it possible for an Euler equation to satisfy the boundary conditions Y(1)=0, Y(2)=0?
I have considered the three possibilities, distinct real roots, repeated roots and conjugate complex roots and cannot find any solutions.
Are there any other possibilities to consider?
Thanks
Hi,
I would like to start from the stress energy tensor for the perfect fluid:
T^{\mu\nu}=\begin{pmatrix} \rho c^2 & 0 & 0 & 0\cr 0 & p & 0 & 0\cr 0 & 0 & p & 0\cr 0 & 0 & 0 & p\cr\end{pmatrix}
where \rho is the mass density and p is the pressure, and I would like to derive the...
Homework Statement
Hi, I'm trying to compute the equations of motion for a car as shown
in the attached image.
α = steering angle
θ = orientation of the car relative to the world coordinate system
Say you're given the linear velocity v and the steering
angle α. How do you compute...
Hi i am reading about signal and systems course . What i want to prove is not a problem that i have to solve is something that the books take for granted and i want to prove it so i ll be able at exams to reprove so i won't have to remember it, (if u don't believe me i can give u the course's...
Hi,
I was wondering if Matlab was the sort of program I'd want to solve the Euler Equations (fluid dynamics).
And if it is, I am sure this must be a very standard problem.. does anybody know of any tutorials for this sort of problem as I have never used matlab?
:-p