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Meep fdtd windows download
Installation procedure, basic simulation, material definition and some advanced features are discussed. I use the python-meep interface for all examples presented. It can compute the propagation of an downooad wave through very complicated structures, using realistic material models including dispersion, conductivity, meep fdtd windows download or nonlinearitiesdistributed computing and combination jeep time-domain and frequency-domain solver.
MEEP is controlled by command-line interface which requires some programming. This has a good purposeas experienced windiws may employ MEEP for problems where more user-friendly simulation software does not provide enough versatility e. On the other hand, it may be quite disappointing to start using MEEP: Setting up a realistic simulation нажмите чтобы прочитать больше usually a challenging scientific meeo on its own, and with MEEP one also needs to write meep fdtd windows download working code.
I will try to provide the reader with a module and examples meep should help to focus on the scientific part of the task. The examples here are based on the python-meep interface. One of the interfaces is python-meep замечательная download movie editing software for pc маразмом its official website at Ghent university.
The reason why I chose the Python interface lies in my preference of Python syntax as well as in many excellent Python modules available scipymatplotlib and mayavi2 will be used in the examples here. I will simply try to provide the reader with several working examples. Get mrep and reuse them as you need! Before we get to writing the first simulation, we will discuss the installation procedure and multiprocessing.
Перейти на страницу python-meep interface has always to be compiled against the MEEP binary present in the system. They seem to work the meep fdtd windows download, so for simplicity, we choose the latter and compile everything with support for MPI.
If our simulation environment meep fdtd windows download built without support for multiprocessing, it would be simply called meep and imported as import meep. All these steps meep fdtd windows download covered by the following blue box, so you may simply copy the commands to your terminal.
It was tested to work flawlessly on meep fdtd windows download systems, mee; in case of any problems, write me an e-mail and I will try to fix it.
The following compilation procedure has been tested on Debian-based Linux distributions, but there should be no principial limitation in running meep and python-meep on and other systems, too. The same holds for older Ubuntu Hereby I thank Martin Fiers for his kind help with the installation process. Failsave alternative: download the 1. Installing MEEP 1. Python-meep needs however to be still built, and I added a little fix to its building script that had to be done in Ubuntu I tested this for the MPI-enabled version only, but it meep fdtd windows download work with the non-mpi one, too.
Note that in the packaged version 1. As ofif frequency-domain solver is to be used, one has to compile the latest version from source see above. For typical simulations, tens to hundreds of megabytes in memory are updated each step. On many computers, the bottleneck limiting the speed of computation is not the CPU frequency, but the frequency of the RAM or even more likely, the front side bus data throughput [see downloav.
The speed of computation depends on many parameters and paralellisation may or may not be advantageous. It is therefore fastest to get along with the non-MPI version of meep here, although the second processor core remains idle.
In some cases, the bottleneck can be in the front-side bus instead of the CPU core. Launching more fdgd 2 processes always gave me even worse results. A related question by Giovanni. Windwos, on a HP Z workstation with 2×4 Intel Xeon E cores meep fdtd windows download 2 sturmovik pc game download GB Meep fdtd windows download, the CPU-RAM communication is evidently fast enough and running simulation in 8 processes reduces ftd time roughly five times, as is illustrated in the following figure: Logarithmic plot of time needed for посмотреть еще time step, depending on the simulation volume and processor cores used for the computation.
Comparison of the Z workstation denoted as Lorentz meep fdtd windows download my notebook. From comparison of the measured speed with linear extrapolation, one sees that the computing power scales well with processor cores employed except for very small problems. To conclude, the answer depends on your computational setup: for older dual-core computer probably not, meep fdtd windows download a new multiprocessor computer definitely yes — one has to try it out in practice.
Simulation basics Conventions In order to simplify the interpretation of results, all the simulations on this page will use the SI units e. In the MEEP’s routines, the speed of light is defined as 1. Opposite procedure has to be done when handling time units etc. As long meep fdtd windows download linear systems are simulated, this convention makes no qualitative difference in the results; see also Meep unit Wiki. We assume the reader will meep fdtd windows download make use of the multiprocessing version, so all examples presented here are MPI-enabled.
Minimal simulation of dielectric sphere Let us look at a 25 lines of python code that already produce an interesting output. You may either launch an interactive python session and insert the commands samsung omnia pc suite software free by one, or copy all the code into one python file, or download the file here: minimal. The real dimensions of the simulated volume will be 2x2x5 micrometers with a reasonable voxel size of 50 nm.
The following code may look a little tricky, because of using the callback. After we tell MEEP what callback to use, we may create the structure object. After that, продолжить чтение struct object stores the value of permittivity in each voxel. By default, the volume boundaries behave as perfect conductor. Ex, meep. We may now let the source transmit a wave and let it propagate through the structure for, say, 30 femtoseconds.
The computational time will be a bit longer roughly 20 s. MEEP writes out the progress each 4 seconds. Note the fields are complex-valued. Ex, vol. If you have h5utils installed, run in bash or your meep fdtd windows download shell: h5tovtk Ex. You meep fdtd windows download experiment changing the structure or letting the simulation timestepping continue to a later time and load the new field into mayavi2 to compare посетить страницу источник it evolves.
But if you wish to run some realistic simulation, do not base your code on this simplistic example. The more elaborate examples below may save you a lot of coding.
Screenshot from mayavi2 with a ScalarCutPlane module, showing the x -component of electric field. From right to left we see the wave that propagated around the sphere, then a wave that still propagates in the denser medium of the sphere meep fdtd windows download focused at rear interface and at the left there is also a weak reflected wave. In the following we will make mepe of them to run a practical simulation. You may download the simulation scriptbut it may be more instructive to separate it into logical parts.
The last import line is again for those without multiprocessing. It accepts some relevant named parameters with reasonable default values. Some of them mfep always be defined, as they are used by the simulation script. The list self. The constructor of each material is pointed to some как сообщается здесь that defines where the material is — it must return self.
But the condition defining the material shape is absolutely arbitrary; it can meep fdtd windows download some implicit function, it can be composed of many logical operations with primitives sphere, cylinder, slab fddt, it can be complicated and procedurally generated. With one limitation: the materials should never overlap except for when you know what you do. AbstractMeepModel the capability to define multiple materials with one class. Moreover, each material can come with possibly multiple properties such as polarizabilities, conductivity, nonlinearity etc.
X, -model. Windiws, -model. Kx, ‘Ky’:model. Get the reflection and transmission of the structure if meep.
Otherwise the first process that succesfully terminates causes premature termination of all other. This often manifests as a corrupt or incomplete HDF5 file being saved. It may save some work to write down which directory came the most recent simulation. The multiprocessing simulation always ends with a warning mpirun has exited The windoqs it uses is built of nondispersive materials and the meep fdtd windows download fields can be viewed meep fdtd windows download Mayavi2 or processed by the MEEP’s builtin postprocessing functions.
However, when one decides to compute some practical problems, usually a lot of pre- or postprocessing code has to be written. Programming in python provides great possibilities, but the most often needed functions are in fact quite basic.
This is not meep fdtd windows download exhaustive documentation, but rather an “advertisement” for the functions available. Their exact usage will be illustrated in the next chapter, where one more elaborated simulation employing all the following functions is presented.
Definition of the structure In the simple simulation above, we were already forced by technical meep fdtd windows download to use an object to define the permittivity. We can fully take advantage of the object programming and store the whole structure in one class. This results in cleaner code and also in much easier meep fdtd windows download between different structures to be simulated. Callback Most of the methods defined by AbstractMeepModel simplify the meep fdtd windows download quite intimidating interaction with python-meep’s internals.
There are several ways how to define the structure in Python-meep. Unfortunately, the most convenient predefined primitives available in scheme-meep are not available in python-meep because they are provided by libctl, which is not processed by SWIG yet. Instead, we suggest to use the slow, but convenient callback approach: when defining the structure, MEEP calls some user-defined method for each point and each material in источник статьи to find out whether the material is or is not at the meep fdtd windows download point.
Of course that one can complement them with own code, for instance to define some implicit plane like a parabolic mirror. With a little practice, one can write the structure definition quite effectively.
It is very helpful to check the resulting structure in Fdtx, as discussed below. This allows one to define the losses, http://replace.me/20701.txt dielectrics, metals, etc. A separate chapter is dedicated to this topic. Another good feature of MEEP is the frequency-domain solver.
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WebJun 04, · Examples of FDTD calculations with MEEP. Contribute to awojdyla/meep_fdtd_examples development by creating an account on GitHub. To run these scripts, download them (Linux, or if you’re courageous Mac. The Windows 10 Linux subsystem should work too.) Type for example: meep replace.me At the end of the . AdNot enough space? Get more free space with the New Avast Cleanup. Download free! Slow & cluttered PC? Clean it up with the new Avast Cleanup. Download free now! WebMeep is a free and open-source software package for simulating electromagnetic systems via the finite-difference time-domain (FDTD) replace.me is an acronym for MIT Electromagnetic Equation Propagation.. Features. Free and open-source software under the GNU GPL.; Complete scriptability via Python, Scheme, or C++ APIs.; Simulation in 1d, . WebAug 25, · Meep (or MEEP) is a free finite-difference time-domain (FDTD) . WebApr 25, · Meep (or MEEP) is a free finite-difference time-domain (FDTD) Missing: windows.