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Questions tagged [visualization]

Questions relating to graphing and displaying numerical data

3
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2answers
102 views

Recommended visualization tools for higher order finite element solutions?

Is there any software available which can directly render higher order finite element results? In particular, 3D finite elements would be preferable. It seems gmsh has some capability in this regard ...
3
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1answer
52 views

Plotting or Visualizing a Higher dimensional vector field

I am trying to visualize a higher dimensional vector field. Is there a way to do this. I asked this question here, I was told to post it here. As an example, one can use $$\begin{eqnarray} \dot{x}...
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0answers
67 views

Showing date in Paraview's Annotate Time Filter

I have a time dependent data set where each frame corresponds to a certain date. I need to show the time annotation, much like what Annotate Time Filter does, but show the date instead of time as a ...
0
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1answer
61 views

C++ library unstructured mesh writer to VTK format (or similar)

I am working on a 2D unstructured code in C++. I am using gmsh to generate a 2D unstructured mesh and reading it into my program with a library called ...
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0answers
70 views

Using VTK how to do water flow representation

I am working on a project regarding retrofitting (in a virtual environment) using VTK and I have a point cloud data which is collected using a scanner from the area where I need to retrofit. I ...
4
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2answers
460 views

3D contour mesh computation

I have the value of a function in three dimensions, $f(x, y, z)$, which varies smoothly. I would like to compute a 3D mesh where $f(x, y, z)$ has a particular value. Are there algorithms to do this? ...
0
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1answer
62 views

How to report non-monotonic runtimes in convergence plots

Let's say I have an algorithm that can be tuned by a parameter $h>0$ and is expected to converge as $h\to 0$. I want to study the computational complexity of this algorithm, i.e., how the ...
0
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1answer
91 views

temperature profile on axial direction of a chamber

I have a task to plot average temperature profile at each cross-section in the axial direction of a combustion chamber. I have $x$, $y$, $z$ coordinates data in excel as well as the corresponding ...
0
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1answer
126 views

Code to output VTK point data from decomposed domain for Paraview [closed]

I am developing a parallel 2D CFD code in C++ using PETSc and would like to use it as an opportunity to learn about VTK/Paraview. Right now, I have each processor output an ASCII file for the portion ...
0
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2answers
218 views

How to represent CFD result when I use grid-centered FVM?

My variables are stored at the center of the cells. How can I transfer these values to grid points? If I calculate the algebraic average value there may be a shock.
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0answers
310 views

3D visualization of the results of a 2D simulation in COMSOL

Considering that COMSOL forum is dead and CFD-online is not responsive, I'm gonna try asking my question here: I have done a 2D simulation in COMSOL multiphysics. I have two independent variables x ...
4
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2answers
371 views

How do I migrate from Legacy VTK (Structured Points) to XML (Structured Grid)?

The documentation is fairly confusing and I know that I need to keep track of the actual grid location of my data. Writing a python script to convert binary data into this vtk format. I want to leave ...
4
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3answers
399 views

Pre/Post-processor for an academic finite element solver

I'm currently developing a finite element solver for academic/research purposes. Therefore I'm searching for a pre- and postprocessor in my toolchain. For a previous project I have used gmsh as a ...
6
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3answers
240 views

Visualizing the solutions of the Differential equations by varying different parameters

Actually I am interested in analyzing the soution to the ODE given as $\frac{dy}{dx} = A + By + C\sin(y) , y(l) = m$ and check how the solution gets affected like whether they exist or not depending ...
0
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1answer
164 views

4D visualization in MATLAB

I have a function of 3 variables like $V= f(r1,p,r2)$, I want to plot these 4 data in one graph to be able to capture behavior of V with respect to all three variables. I searched a little bit and ...
2
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2answers
333 views

In practice, what are the most useful ways to visualize 2d fluid flow, to tell what is happening in the simulation? Esp for verification and debugging

My simulation creates a 2d grid of vectors and scalars (EDIT of velocity, depth etc), at 60 frames per second. Is it correct? It looks sort of right... but who knows? How can I tell what's happening - ...
1
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1answer
1k views

Rescaling x-axis data in Paraview

I am working with VTK legacy files containing vector information. The files have incremental extension representing a file series as defined by this link. When applying the filter "Plot Selection ...
2
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1answer
170 views

15 noded triangular elements in paraview

I am modelling a soil medium in plane strain and would like to determine if paraview supports the 15-noded triangular element as shown on this link. On the documentation I am only seeing elements up ...
1
vote
1answer
94 views

VTK: Missing Streamlines due to error in Runge-Kutta method?

We are using Kitware VTK to visualize our models. When we display streamlines, it sometimes happens that a single streamline is left out. This can be especially seen when duplicating a model several ...
0
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1answer
55 views

Dynamic Analysis and Visualization of Laminate Mindlin Plate

I am trying to make the jump from a FEM plot of a static load applied to Mindlin laminate plate to a surface visualization of various Mode Shapes of the Laminate Plate. For that, I understand that the ...
5
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2answers
227 views

Alternatives to Mathematica

looking to introduce a mathematics program in my work, I would have 2 uses: In a classroom (high school level), providing good visualisation of physics ideas, and making my lecture more interactive. ...
1
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1answer
165 views

Matlab: Creating a matrix that represents a colored, sinusoidally-modulated grating

I would like to draw a texture (in Matlab - Psychtoolbox) which is composed of a sinusoidally-modulated isoluminant (magenta & cyan) grating. I do have the RGB matrices of the two phases (for ...
11
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1answer
932 views

Visualization of quadtree & octree grids

So-called quadtree and octree grids are quite attractive for applications requiring adaptive mesh refinement. They are for example used in Gerris and Paramesh. Is anyone aware of a good file format ...
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2answers
5k views

CFD visualization workflow: Visit vs Paraview vs Tecplot and others

For those familiar with more of these tools than I am, what are the pros and cons of the various tools available? Right now I exclusively use Tecplot for CFD visualization, but it leaves a lot to be ...
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1answer
47 views

What are the computational solutions for periodic visualization of simulation?

I like to set my scientific simulation programs to generate a picture after a certain number of iterations, such that I can follow what is happening and maybe cancel the simulation before the ...
9
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3answers
866 views

Second order tensor field visualization software

Is there an overview available over tensor visualization software? My personal preference is: A software which is free, well documented, and offers visualization techniques for different physical ...
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0answers
493 views

best package choice for visualizing agent based model simulations in python

This is a visualization/programming design problem. I am working on building a geospatial agent based model, meaning that there are multiple agents interacting within some particular spatial container....
2
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2answers
84 views

What's the role of visualization?

I'm just starting at scientific computing and I'm seeing that results can be generated merely by plotting the variables. Of course more variables lead to more axes/dimensions so e.g. a three variable ...
2
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1answer
193 views

Creating a 3D spatial density map from simulation results

I want so visualize the spatial density for my simulation. The result of my simulation is a (time-dependent) system of large number (~100k) of moving particles in a confined space. Each particle has ...
3
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0answers
308 views

C60 orbital calculation

I am currently trying to reproduce the results published by Hands et al.1 using MATLAB. They calculated the bases of the C60 wave functions of HOMO, LUMO and LUMO+1. I did the following: I ...
1
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1answer
1k views

Paraview: Multiple csv files to time series

I have multiple CSV files with point-coordinates and, possibly, multiple data values attached to them, i.e., the rows look like x y z data1 data2 ... Is there ...
3
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2answers
452 views

Should a colorbar have constant values throughout a simulation?

The default option for matplotlib's pcolormesh (also true for VisIt and I think also true for Matlab) is to allow the maximum and minimum of a colorbar vary. Which ...
3
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0answers
33 views

Is there a library which allows for converting 4D implicit surfaces to simplexes?

I have a 4D surface in the form of the spin quadric. I would like to display this surface onto the screen. One of the method which I would like to use to present surface onto the screen is projection. ...
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0answers
380 views

3D animation of a vector field (ParaView) [duplicate]

I am trying to create an animation of a 3d vector field in ParaView. All my data is in three matrices (201 x 201 x 201) corresponding to vectors components in x,y,z directions. And it's calculated in ...
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2answers
71 views

Help on writing sofware: general guidelines, in particular separation of computation and visualization

Although I already did some work in the intersection of theory and simulation I'm still very new to this field and I need some guidance. If anybody can give some recommendations for introductory ...
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2answers
540 views

How-to: Epic visualizations of 3D fractals?

I have seen videos like this before in the past of things like "3D Mandlebulbs" and similar fractal sets, but can anyone tell me what sorts of programs are actually used create these visualizations? ...
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1answer
373 views

Visualizing the difference of two sets of VTK files

I have two sets of 300 VTK files and I want to get a graph comparing the average difference of the two sets. All files have a structured grid containing a scalar value named phi. At the end, I need a ...
0
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1answer
81 views

Rendering Huge Data with Renderman Interface Bytestream

I have tones of geometrical objects (spheres, meshes) I want to render: One way would be to first write a .rib file which could be certainly done and then push that file to a renderman compliant ...
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2answers
2k views

How can one produce a proper streamline plot?

I recently had trouble producing a proper streamline plot in Mathematica, and apparently the problem is a good bit harder than I appreciated. I would like to know if there exist general algorithms to ...
1
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1answer
608 views

VTK File: How do I save data on a cell face?

I am writing a program that creates a vtk file with a Rectilinear Grid. I am able to save data to each one of the cells using CELL_DATA, but now, I need to save data to each one of the cell faces (x6)....
1
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1answer
2k views

a circular plot from a vector which represents the temperature along the radius surface, which is the same for every radius

I have calculated the temperature of the section of a cylinder, which is subjected to a heat flow on its upper surface. Getting the temperature distribution in the 2D section. As shown in the ...
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0answers
218 views

Printing a plot in Octave-3.8.1 breaks LaTeX labels [closed]

Since upgrading to Octave 3.8 I have been unable to export plots with LaTeX labels. When the figure is displayed the labels render fine but when I try to export the figure using the ...
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2answers
5k views

Visualising Maxwell's equations using MATLAB

I asked this question to help me understand what is going on in one of Maxwell's equations. I am happy with following through the maths on paper now, but would like to use MATLAB to take it one step ...
6
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2answers
3k views

Using numpy arrays in Paraview programmable filter

How can I access a field in Paraview's programmable filter as a numpy array? I want to: Import an existing field as a numpy array Create a similar array for output Register it as a new field for ...
2
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2answers
1k views

visualization of 3D probability flow

I have a master equation for $P(N_A^+,N_B^+,N_C^+,t)$, with $N_A^+,N_B^+,N_C^+$ all discrete. The numerical integration is done by this Matlab program using Euler's method. Despite the crude Euler's ...
6
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2answers
446 views

Simulating advection over a network of 1D pipes

I am trying to create a simulation to help visualize how different chemical components flow through a network of pipes with associated valves, pumps, and chemical inputs. In this simulation, the pipes ...
0
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1answer
84 views

Plotting 3d dimensional histogarm in a spatial grid

Is there any tool to plot 3d dimensional histogram in a spatial grid? Preferably are there any filters or operators in Paraview or Visit for this?
6
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3answers
5k views

Visualizing finite element solutions in MATLAB

On my triangular mesh, I have the $(x,y,z)$ coordinates of each vertex of each triangle. For higher order elements, I refine each element a few times so I have more points to work with. If I just need ...
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4answers
10k views

How do I calculate the numerical difference between two fields stored in two different VTK files with the same structure?

Suppose I have two VTK files, both in structured grid format. The structured grids are the same (they have the same list of points, in the same order), and there is a field, call it "Phi", in each VTK ...
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2answers
2k views

Converting VTK point dataset of scalar values to a smooth surface

Does Paraview or Visit have any filters to draw a smooth surface for a set of points?