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An inner solution is coming from a Time-Dependent, Eigenfrequency, or Auxiliary Sweep study. In contrast, an inner solution is, in the Optimization settings, referred to as just Solution. In this context, an outer solution is a parametric sweep solution over a parameter such as a geometric dimension. The new Optimization setting controlling the objective definition is called Outer solution. The objective function is interpreted as either a sum, maximum, or minimum over the Parametric Sweep study solutions.
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Note that this functionality is different from what is known as discrete optimization. This functionality is useful when several sets of fixed parameter values need to be considered in an optimization problem alongside one or more control parameters. You can now optimize over a general Parametric Sweep study including sweeps over geometric dimensions. Two Parameter groups for materials and geometry, with two sets of values each the Parametric Sweep can be used to solve for all four combinations of Cases. For other physics, the Reuse sparsity pattern option is disabled by default, but it can be manually enabled under the Advanced solver node and its Assembly Settings section.
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By default, the new Reuse sparsity pattern option is enabled for many of the physics interfaces used for fluid flow, transport phenomena, and structural mechanics. The functionality takes a little more memory, typically a few percent more, but can give up to 15% reduction in solution time. Continuing this development into the latest version, new solver functionality reuses the system matrix sparsity pattern from a previous step, which is important for nonlinear and time-dependent analyses. Up to 15% Faster SimulationsĮarlier versions of COMSOL Multiphysics ® included performance improvements based on reusing data from previous matrix assembly and solver steps. For macOS and the Linux ® operating system, this level of performance has been available since earlier versions. The performance improvement is only seen for recent processor architectures when using eight or more cores. Thanks to a new and more efficient method for memory allocation, the overall solver performance has improved by several times for certain processor architectures in the Windows ® operating system. Several Times Faster Solving in the Windows ® Operating System Learn more about all of the updates relating to studies and solvers below. COMSOL Multiphysics ® version 5.4 includes faster solving with newer processors in Windows ® thanks to new memory allocation, up to 15% faster CFD simulations due to new reusing of sparsity pattern, Parametric Sweeps over parameter groups, and optimization for Parametric Sweeps.