Hi,
Let us suppose we have three real matrices A, B, C and let \circ denote the Hadamard product, while AB is the conventional matrix product. Is this relation true for all A, B, C matrices:
C \circ (AB) = A( C\circ B)?
I looked at it more thoroughly and I realized that this assumption is...
If I understand well, you want to make the counter smaller than the denominator. It can be done winthin an inline environment as eg.
Let us see the following equation: $\frac{a}{\displaystyle a}$
I would like the determine the work done by gravity on a mass attached to a rod (see the attached image). The rod is assumed to be weightless and rigid.
I start from the definition of work:
W_{AB} = \int_{\mathbf{r}_A}^{\mathbf{r}_B} \mathbf{G}\cdot \mathrm{d}\,\mathbf{r}.
In the x-y coordinate...
So if I am not mistaken I should do the following for each particle:
1. Solve the initial-value problem to gain \vec{r}(t,\vec{R}) at different time steps. For this I must solve an IVP consisting of 2 equations because of the 2D-problem. But I have \vec{v} at discrete points at each time.
2...
Dear all,
I solved the Navier-Stokes equations in Eulerian description. I would like to illustrate it as follows:
I thought to place particles in the domain which will characterize the fluid flow. However I must know the particle position in the Lagrangian specification. As I place the...
I do not know the finite difference approach, but I speak about the steady-state spectral or finite element solution of the problem. To prevent the checkerboard pressure distribution, one should use elements that satisfies the Babuska-Brezzi condition.
Spurious pressure values come up when we use the non-staggered approximation for the velocity and pressure. However programming spectral methods (as I deal with the spectral collocation of the Stokes-equations) is hard for staggered-grids except the case when we apply homogeneous boundary...
Hi,
When we want to solve the Navier-Stokes equations coupled with the conservation of mass for incompressible fluids using the primitive-variable approach, we have to face to the problem that the equation for the continuity equation does not contain the pressure which leads to spurious...
Hi,
I would like to solve the steady-state incompressible Navier-Stokes equations by a spectral method. When I saw the classic primitive-variable finite element discretization of the time-dependent incompressible N-S, it turned out that the coefficient matrix of the derivatives of the unknowns...
1. Why are they linear PDEs? See http://encyclopedia2.thefreedictionary.com/Hamilton%27s+Canonical+Equations+of+Motion. I do not refer to the Hamilton-Jacobian equation: http://en.wikipedia.org/wiki/Hamilton%E2%80%93Jacobi_equation
2. So you mean that it has nice properties when we use apply...
Hi!
I would like to know that in what circumstances Hamilton's canonical equations are superior to the Lagrange-equations of the second kind. We know that every second order equation can be rewritten as a system of first order equations.
Thanks,
Zoli
I realised that a dependent parameter (the consistency index: K[Pa s^n]) includes this non-dimensional parameter and this is the only one that changes when we consider a power-law fluid instead of a Newtonian fluid. Therefore we do not have to take this non-dimensional parameter into account as...
I would like non-dimensionalize the equations which describe a non-Newtonian fluid model. In the constitutive equation (power-law model) there is a non-dimensional parameter: n. According to Buckingham's Pi theory, I must take all the relevant independent parameters (variables, constants, etc.)...