All Questions
9 questions
1
vote
1
answer
172
views
How to remove sigularities from 3D Vortex Lattice Method
I'm trying to solve aerodynamics of whole aircraft by vortex lattice method (or deeper here). The problem is that sometimes trailing vortex filaments from Horse Shoe Vortexes of main wing hits panels ...
- 937
1
vote
0
answers
96
views
Vortex Lattice Method: better basis than horse-shoe vortex?
I read several introductory texts about potential flow and vortex lattice method. Basically, it is fitting of some velocity field described by conditions on velocity at some control points using basis ...
- 937
1
vote
0
answers
241
views
Physics of explosions: just vorticity?
eg 1 2. Is it just vorticity? What's actually happening? (Similar: steam engines, volcanoes, clouds).
examples are grid-based, using "vorticity confinement" in Phoenix FD.
EDIT Some techniques: "...
- 364
2
votes
2
answers
379
views
Can we simulate compressible flows by simple direct explicit calculation, without solving systems of linear equations (such as Poisson eq)?
Is this is plausible at all? It seems the most obvious/naive approach, so there's probably good reasons why it's not used - what are they?
Viscosity is not important.
Starting with inviscid Navier ...
- 364
4
votes
1
answer
222
views
Compute 2d velocity field with given curl and zero divergence
Given $\omega$ I want to compute the vector $q=(u,v)$ such that
$$
v_x - u_y = \omega, \qquad u_x + v_y = 0, \qquad \textrm{in } \Omega
$$
and
$$
u n_x + v n_y = 0, \qquad \textrm{on } \partial\Omega
$...
- 3,078
3
votes
3
answers
2k
views
Time step size for transient simulations of vortex shedding
I am simulating unsteady flow around a circular cylinder (using FLUENT). I am facing the following problem. Kindly please help me.
OBJECTIVE:
To find out the Reynolds number at which vortex shedding ...
- 39
3
votes
0
answers
63
views
Discretizing boundary conditions for vortex methods
I am working on a fluid simulation using vortex methods. For this I must compute the vortex sheet on my boundaries given as:
$$
\gamma(\mathbf{x}) - \frac{1}{\pi}\int_S \frac{\partial}{\partial\mathbf{...
- 31
2
votes
2
answers
2k
views
Vortex Panel Method implementation
I'm trying to understand and implement panel methods for a two-dimensional airfoil.
I haven't found yet a very detailed explanation on how to implement it, and there are some things I don't' still ...
- 21
7
votes
3
answers
6k
views
Tutorial for flow around a cylinder in FEniCS
I am continuing my dive into computational fluid dynamics. I would like to build a simple test case for modelling the flow around a cylinder in FEniCS and then continue to model turbulence in order to ...
- 994