VSimColor High-performance computations for electromagnetics and plasmas.


VSim model of potential and dustVSim is a flexible, multiplatform, multiphysics simulation software tool. VSim is designed to run computationally intensive electromagnetic, electrostatic, and plasma simulations in the presence of complex dielectric, magnetic, and metallic shapes.

VSim simulates a variety of problems on regular, structured, orthogonal meshes of complex geometries by using embedded boundaries (cut cells). Geometries can be imported into VSim from CAD models or constructed in the VSimComposer front end. The cut cells, which are where the geometry intersects the grid, define the non-grid-aligned, or conformal, field and particle boundaries.

VSim's conformal Finite-Difference, Time-Domain (FDTD) methods and conformal particle boundary conditions enable rapid computation of Maxwell's equations.  Whether your experiment depends on using a full or approximate model of Maxwell's equations, VSim provides the accurate solution.

Self-consistent solutions in the presence of charged particles are carried out by VSim using particle-in-cell (PIC) methods and/or charge fluid methods. You can post-process your resulting data using VSim's built-in analyzers or your own Python analyzers. Incorporating your own custom analyzers into the VSim framework is simple.

Switch easily between 1, 2 or 3 dimensions, and then watch your model run rapidly using algorithms designed for the exacting demands of high performance computing systems, whether on your laptop or supercomputing cluster. VSim easily installs and runs on a variety of systems, including Windows, MacOS, and Linux platforms.

VSim for Basic Physics (VSimBase), which contains the VSim code's base functionality, can be used alone to study phenomena that have slab (grid-aligned) shapes. VSimBase includes electromagnetic and electrostatic solvers with collisionless plasma dynamics. The advanced VSim packages [Electromagnetics (VSimEM), Microwave Devices (VSimMD), Plasma Acceleration (VSimPA), Plasma Discharges (VSimPD)] augment VSimBase functionality with specialized capabilities required for those physics application areas. The advanced packages incorporate high-order methods to simulate cut cells, both primary and secondary electron emission, dispersion control, sputtering, collisions, and field ionization. All VSim packages provide a powerful tool, covering a wide range of physics.

VSim with its packages can be used for everything from education about fundamental processes to advanced simulations of systems with complex shapes. All packages come with rich sets of examples to assist in initial usage.


From the Frontiers of Science to You

In the early years of VSim's development, its Vorpal physics engine was used to meet the needs of United States government and research laboratories.  VSim addressed challenges ranging from plasma acceleration to accelerator cavity modeling to magnetic fusion studies. These advanced computional studies required thousands of processors at the nation's largest unclassified computing facilities. Today you can perform the same simulation modeling on your laptop or workstation. And if you have access to a high performance cluster, of course VSim is the tool of choice.

science cover

September 30, 2004 cover of Nature shows VSim physics engine, Vorpal, results that were used to guide experimental success in plasma acceleration.

VSim continues to be used in both engineering and science, with nearly 700 research articles citing Vorpal as of 2018. Vorpal is a leading plasma-physics capable code cited roughly 50 times per year.


With VSim you pay for only what you need. Purchase only those packages you require, and pay for only the computational capability you use. As your need for computational power expands, add more compute cores to your license and see your price per core drop precipitously, while your simulation capability rises dramatically. As noted below, VSim has parallel efficiency out to tens of thousands of cores, making your investment a good one.

vorpal fdtd scaling



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VSim Packages

VSim packages provide the pricing flexibility and convenience you want. Choose the package or set of packages that has the physics simulation functionality that you need.

VSimBase package icon   VSimEM package icon   VSimMD package icon

Perfect for students who are learning basic electromagnetic, particle trajectory, and plasma physics.


Fast, Powerful FDTD for Electromagnetics that solves electromagnetic problems.


Electromagnetic and particle modeling features for magnetrons, klystrons, and more.

VSim for Plasma Discharges package icon

Enables resolution of kinetic effects for discharges not observable in fluid simulations.


Pay Only for the Functionality You Need

  VSim for Plasma Acceleration icon

Large-scale simulations of laser-plasma and beam-plasma acceleration experiments. 



VSim packages provide you with a diverse range of relevant examples, macros and the powerful graphical user interface to the simulation engine, together with embedded analysis tools. Functionality is collected in common packages to provide the pricing flexibility and convenience you want. Custom packages are also available to give even more flexibility in pricing. See the VSim Features Matrix.

Request a free VSim Evaluation or contact Tech-X Sales for a quote.



VSim Training Courses at Tech-X

If you would like to be contacted when upcoming VSim training courses are scheduled, please contact us for training schedule notification.

Here is a sample agenda from some of our most popular VSim courses.


VSim Class Program for Universities

Tech-X offers a program to enable teaching professors the opportunity to pass along valuable computational skills to students by utilizing VSim to help teach the fundamentals of physics. Learn more.

Customized and Private Training

  • Courses are typically 3-4 days. See sample agendas for typical course contents.
  • Onsite training takes place at in Boulder, Colorado at Tech-X U.S. Headquarters.
Onsite Training Rates
  • Regular rate per trainee: $550/day.
Custom Training Rates
  • Discounts available for 10 or more trainees from a single institution.
  • Prices vary depending on degree of customization.
  • Offsite training costs include travel.
  • Contact us for a quote.



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