Solution dialog box (Acoustics Transient BEM)

Group name
Name	Specifies the name of the solution.
Solver	Specifies the solver for the solution.
Analysis Type	Specifies the analysis type.Transient Acoustic — The BEM solution solves in the time domain, where acoustic excitations are functions of time.Transient Vibro-Acoustic — The BEM solution solves in the time domain, where acoustic excitations are functions of time, and there are fluid-structure interactions.
Solution Type	Specifies the solution type.Acoustic Response — Computes the results for the acoustic model.Vibro-Acoustic Response — Computes the acoustic response of a vibrating structural surface interacting with an acoustic fluid.
Automatically Create Step or Subcase	Lets you automatically create a solution step of the selected type.
Acoustic Response / Vibro-Acoustic Response
Preview	Opens the Information window and shows the contents of the solver input file.
Pre-processing
Start-up Smoothing Factor	The Start-up Smoothing Factor sets smoothing of the initial time segment (0, αT) of the transient analysis to help eliminate undesirable numerical artifacts. The factor is a sin2 function applied to the initial time segment.
Time Range Definition
Step Definition Method	You set the Step Definition Method by setting the analysis time step Time Step (dT) or by setting the Courant, Friedrichs, Lewy (CFL) factor.**Courant, Friedrich and Lewy (CFL)**The Courant, Friedrichs, Lewy (CFL) factor controls the time step of the analysis and therefore the solution stability and accuracy.**Time Step (dT)**You set the desired time step for the analysis.
Courant, Friedrich and Lewy (CFL)	This option appears when Courant, Friedrich and Lewy (CFL) is selected. Numerical solutions of transient phenomena can be inherently unstable, so in most cases you set the CFL factor to be between 0.2 and 2 for an acceptable accuracy and solution time.
Time Step (dT)	This option appears when Time Step (dT) is selected. You set the time step increment.
Duration Definition Method	The Duration Definition Method determines the total time of the analysis.Relaxation FactorThe Relaxation Factor sets the simulation duration indirectly. The Relaxation Factor corresponds to the number of times a residual acoustic impulse can travel, or reflect, between the excitation end time and the end of the analysis. If you desire no acoustic output beyond the end of the excitation, set the Relaxation Factor to zero.**Solution Maximum Time (Tmax)**You set the Solution Maximum Time (Tmax).
Relaxation Factor	You set the solution Relaxation Factor.The Relaxation Factor sets the analysis duration indirectly. The Relaxation Factor corresponds to the number of times a residual acoustic impulse can travel, or reflect, between the excitation end time and the end of the analysis. If you desire no acoustic output beyond the end of the excitation, set the Relaxation Factor to zero.
Solution Maximum Time (Tmax)	You set the Solution Maximum Time (Tmax) for the solution.
Low Pass Filter for Input and Response Signals
Requested Maximum Frequency	Requests the Maximum Frequency low pass filter to be applied to your simulation.The solver can apply a low pass filter to the input excitation. Excitation frequency components above the Low Pass Filter Frequency are ignored.
Output Requests
Output Requests	Specifies the output request for the solution.Select an existing output request from the list or click Create Modeling Object to create a new output request.Click Edit to edit the selected output request.For more information, see Requesting output for Acoustics BEM analysis and Request output for Direct Acoustic, Indirect Acoustic, and Indirect Vibro-Acoustic analysis types (Acoustics BEM).
Job Control
Run Job in Foreground	Runs the job in foreground.

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Solution dialog box (Acoustics Transient BEM), Simcenter 3D 2021.1 Series

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