![]() ![]() ![]() Detail: Undefined value found in the equation residual vector. Number of degrees of freedom solved for: 24142. Number of degrees of freedom solved for: 24141. I have the same errors on both Windows 8, 圆4 and Fedora 20, 圆4 computers.Ĭomplete mesh consists of 8047 domain elements and 519 boundary elements. I try to calculate bipolar_transistor.mph example from COMSOL library models.Īfter sucsesful finishing study "V_B sweep, V_CE=0.5 V, V_E=0 V" I run Compute command for study "V_CE sweep, V_E=0 V, I_B=1 uA" and recieve Error message "Undefined value found in the equation residual vector". ![]() Mixer Module: analysis of stirred mixers and reactors with tools for free surface modeling and non-Newtonian fluidsĬOMSOL Multiphysics 4.4 can be downloaded at Enjoy version 4.4! Optimization Module: additional gradient-free method (BOBYQA) for dimensional optimization and additional gradient-based method (MMA) for topology optimization Particle Tracing Module: efficient method for particle-field and fluid-particle interactions RF Module: ports on interior boundaries (reintroduced from version 3.5a) AC/DC Module: now includes 167 nonlinear magnetic materials CFD Module: dramatically increased conservation of mass and energy for laminar flow Acoustics Module: Linearized Euler equations for aeroacoustics simulations Heat Transfer Module: fast methods for radiation in participating media, thermoelectric effect, and heating of biological tissue Structural Mechanics Module: easy access to rotordynamic forces, updated shell-solid couplings, and fast method for contact If/else statements in the model tree for conditional geometry creation Geometry subsequences for user-defined geometric primitives Auto-complete search to quickly find variables to use in results in the Windows version One-click select: hover-and-click selection method speeds up the modeling process * View each physics interface as a separate node in the tree * Choose from built-in multiphysics couplings * Combine physics interfaces to define your own multiphysics ![]() A completely new Multiphysics node in the model tree for setting up multiphysics models New COMSOL Desktop interface for Windows with a ribbon design that provides easier navigation Learn about the new multiphysics coupling functionality, the enhanced user interface, and more at News in COMSOL Multiphysics The most powerful multiphysics software just got more powerful: We are excited to announce that the latest release of COMSOL Multiphysics, version 4.4, is now available for download. To try to understand what was going on, I decided just explore higher angular rates using the actual magnetic_brake.mph model, and to my surprise it behaves just the same way: The model is distributed with an initial angular rate of 1000 rpm (as set by the dV0 term in the Global Definitions: Parameters list), but try bumping it up to 10,000 and it fails to converge and by 100,000 it also issuses "NaN or Inf found when solving linear system using SOR".Īs everyone has access to the online magnetic_brake.mph example, could someone help me understand what I have to do to get such mef models to converge when using higher velocities? If I increase the angular rate by small increments from where it works to the speeds where this error is issued, at some point the model simply fails to converge. I've gotten my model to work at low angular rates, but whenever I attempt to increase to higher velocities, the model issues an :" - Detail: NaN or Inf found when solving linear system using SOR" error. I'm currently modeling a situation quite like COMSOLs example of the magnetic brake as expressed in the magnetic_brake.mph file in the example forums. ![]()
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