Is it a sickness that so many papers present 3D streamlines via commercial Anasys Fluent/CFD-Post/Tecplot?
- Tecplot: Surface streamtraces or streamlines are confined to the surface on which they are placed.
- Tecplot: A streamtrace is the path traced by a massless particle placed at an arbitrary location in a steady-state vector field. Streamtraces may be used to illustrate the nature of the vector field flow in a particular region of the plot.
- Fluent: Pathlines are used to visualize the flow of massless particles in the problem domain.
- CFD-Post: A streamline is the path that a particle of zero mass would take through the fluid domain.
In fact, these are representations of pathline.
I don't understand how this is a "sickness". Streamlines (or pathlines) can be quite helpful in presenting flow patterns. There are many ways to create these. One way is essentially particle tracking. Lagrangian particle tracking is slower than a herd of snails but Hamiltonian works quite well.
I think you should use the below information to draw the streamlines.
"Streamlines are a family of curves whose tangent vectors constitute the velocity vector field of the flow. These show the direction in which a massless fluid element will travel at any point in time."
I realdy did not undestand the question... but for whom read this after: some possibilies to post processing.
Tecplot are able to generate streamlines in 1, 2 or 3D velocity fields, all it will depends uopn from them are released. You can choose... there are at least fivr option do it. Under Analuzee TAB there is an option to generate particle paths amd streaklines.
On both you can inform the particle, radius, mass, initial velocity, drag coeficient and gravity acceleration modulus and direction.
For Particle path, if the particles have no mass, no gravity and drag are null, the result it will be the same as streamlines (they are generates as a MESH, you need turnon mesh viwe to see them) - if you have a unsteady flow ( changes on stremlines), I think the tecplot will calculate the trajectories from initial to end time. And Streakilines are transient in this conception, and the result are the same for particle paths but you can animate them! It is a lagrangeam post processing with one way coupling.
All them work from any dimension 2or 3D, steady or unsteady
CFD post, works for 3D always, even a 2D case is loaded - CFD Post was CFX Post in the past, and ANSYS CFX is alway 3D. There is some translation from FLUENT data do CDF-post, and a slim 3D geometry is created from 2D Fluent DATA. But you have a real 3D case genetare surface or volumetric Streamlines from where you want a plane, from point, lines, or any geometry entity you have created.
Particles trajectories are load as a other data file - Fluent and CFX generate this files and they need to be loaded after the case. This avoid crashes for a large numer of particles.
Oh, and there is ENSIGHT (CEI now ANSYS) - there is the same Tecplot approach.
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