The Physics and Variables Selection, Values of Dependent Variables, Mesh Selection, Adaptation and Error Estimates, and Geometric Entity Selection for Adaptation sections and the Include geometric nonlinearity check box are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.
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Around shift (the default), to specify some search criteria manually. See Manual Eigenfrequency Search Settings (Around Shift) below.
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Rectangular, to define a rectangular eigenfrequency search region in a complex plane. See Rectangular Eigenfrequency Search Region Settings below and The Eigenvalue Solver Algorithms.
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Select Closest in absolute value (the default value) to search for eigenfrequencies that are closest to the shift value when measuring the distance as an absolute value.
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Select Larger real part to search for eigenfrequencies with a larger real part than the shift value.
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Select Smaller real part to search for eigenfrequencies with a smaller real part than the shift value.
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Select Larger imaginary part to search for eigenfrequencies with a larger imaginary part than the shift value.
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Select Smaller imaginary part to search for eigenfrequencies with a smaller imaginary part than the shift value.
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The Stochastic Estimation works as a Compute to Selected step. Because the Stochastic Estimation action does not solve the eigenvalue problem, there will not be any valid solution from this action. So, if the Stochastic Estimation action is done for a single step or the first step in a multistep study, there will not be any solution that can be used for postprocessing and results analysis. If the action is done for a step after the first step in a multistep study, the main solution of the sequence corresponds to the study step right before the eigenstep for which the estimation is done.
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Solution to use a solution as a linearization point.
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Any other available solution to use it as a linearization point. It can be the current solution in the sequence, or a solution from another sequence, or a solution that was stored with the Solution Store node. You select a stored solution by changing Use to the name of the stored solution. Choose a solution using the Selection list (see Values of Dependent Variables under Common Study Step Settings).
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Tuning Fork: Application Library path COMSOL_Multiphysics/Structural_Mechanics/tuning_fork.
For a model that uses a search region for the eigenfrequencies, with the Acoustics Module, see Helmholtz Resonator Analyzed with Different Frequency Domain Solvers: Application Library path Acoustics_Module/Tutorials,_Pressure_Acoustics/helmholtz_resonator_solvers.
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