COMSOL is the developer of COMSOL Multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems. COMSOL Multiphysics. With a COMSOL model from an Excel worksheet. Select Update COMSOL Part Library. To COMSOL_MultiphysicsInstallationGuide. See what's new in the Wave Optics Module in COMSOL Multiphysics® version 5.2a.
Plasma Module Updates For users of the Plasma Module, COMSOL Multiphysics ® version 5.3a brings a new physics interface for modeling capacitively coupled plasmas orders of magnitude faster than before, with several new features and tutorials included to demonstrate the functionality. Fosse Sam Wasson Epub Bud. Learn about these plasma updates below. New Physics Interface for Modeling Capacitively Coupled Plasmas The new Plasma, Time Periodic physics interface has been added for modeling capacitively coupled plasmas (CCP) with significantly faster computation times. Instead of solving the problem in the time domain, the periodic steady-state solution is computed with a new approach. The physics interface attaches an extra dimension to the underlying mathematical equations representing one RF cycle and enforces periodic boundary conditions in the aforementioned extra dimension.
This avoids having to solve for tens or hundreds of thousands of RF cycles, which typically takes a long time before the plasma reaches the periodic steady-state solution. This novel approach maintains all the nonlinearity of the model while dramatically reducing computation time: 1D models take seconds to solve and 2D models typically take on the order of an hour for a given power input. Compared to solving the problem in the time domain with COMSOL Multiphysics ®, the following speedup is observed (assuming 50,000 RF cycles before the discharge reaches its periodic steady-state solution). Dimension Approximate Time (Version 5.3) Approximate Time (Version 5. Kitne Ajeeb Rishtey Hai Yaha Pe Mp3 Song Download more. 3a) 1D 10 hours 20 seconds 2D 2 weeks 1 hour Additionally, this new modeling approach has the following advantages: • Integrals performed over both the extra dimension and the base geometry can be used in the equations themselves. This allows the contacts and terminals to be driven directly with a fixed power rather than a fixed voltage, which is important not only for numerical stability but also for discharges where an alpha-to-gamma transition occurs.
In these cases, a given voltage excitation could produce two different solutions depending on the initial conditions; but with a fixed power, only one physical solution exists. Also, the discharge power is usually known, whereas the electrode potential is often not. • The DC self-bias can be computed easily with an additional equation, rather than the ad hoc methods used in traditional methods.
• Parametric sweeps over the operating conditions are fast and easy, since the problem is not solved in the time domain. For 1D models, a range of powers, pressures, frequencies, etc. Can be swept in only a few minutes.
• Matching networks are more easily included in the model, so the plasma can be driven from an L-type matching network. Additionally, it is easy to compute the plasma impedance at the fundamental frequency, which is useful when designing matching networks. • The harmonics generated by the plasma are still resolved by the method; there are no approximations in the model. It is possible to observe how these harmonics in the discharge current can lead to an impedance mismatch when driving with an external circuit. • The method is well suited for a modern computer architecture, since reassembling and paging in and out of memory at each time step is not necessary. Nearly all the time is spent performing the factorization of a sparse matrix with a direct solver, which is highly parallelized and runs at a very high FLOPS rate. New Features with the Plasma, Time Periodic Interface Electrical Excitation While modeling in the new Plasma, Time Periodic interface, electrodes can be driven with either a fixed voltage or a fixed power from a Metal Contact or Terminal boundary condition.