Acoustics BEM solver environment

The Simcenter 3D Acoustics BEM solver environment, which uses the boundary element method (BEM), can solve interior and exterior acoustic and vibro-acoustic problems.

BEM is a valuable tool for several types of engineering problems, especially for acoustic simulations with unbounded domains. You can use BEM to solve exterior radiation problems, such as predicting the sound radiation from engines and machinery. BEM solves the acoustic quantities using the boundary of the acoustic domain instead of the acoustic domain itself. Therefore, you need to define only the bounding surfaces. By meshing only the boundary surface of the acoustic domain, the BEM model size is smaller than a corresponding FEM model, but the system matrix is denser than in a FEM.

BEM is based either on the direct or indirect boundary integral formulation of the problem. When you solve a BEM solution, the solver follows a two-step process:

1. Determines the distributions of the boundary variables.

2. Uses the boundary surface results of the first step to obtain the field variables at any point in the continuum domain from the boundary integral formulation.

The following analysis types are available:

• Exterior direct BEM acoustic analysis — The acoustic fluid is present on the exterior of the boundary element mesh to simulate exterior radiation. The direct BEM analysis works only on closed geometries where the boundary forms a simple closed surface without holes, openings, or stiffening ribs.

• Indirect BEM acoustic analysis — Both closed and open geometries are allowed and the acoustic fluid is present on both sides of the boundary element mesh. The indirect BEM analysis can handle interior fluid domain and exterior radiation simultaneously. Indirect BEM allows you to analyze a wide variety of geometries, including geometries that contain holes and openings, and so on, as well as T-shaped stiffening ribs.

• Indirect BEM vibro-acoustic analysis — The interior and exterior fluid domains are separated by a structural boundary. You can use one-way (weak) fluid-structure interaction or two-way(strong) fluid structure interaction between the structure and acoustic fluid.

For example, you can use an indirect acoustic BEM analysis to analyze the noise radiation of the housing of a generator.

Acoustics BEM model of a generator within housing

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter 3D Acoustics BEM as the specified solverDirect Acoustic, Indirect Acoustic, or Indirect Vibro-Acoustic as the specified analysis type
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file → New Solution

How do I

Plot acoustic results (FEM acoustics)

Learn more

Acoustics BEM workflow

Acoustics BEM remote solving workflow (Linux)

Checking your model prior to solving (Acoustics BEM)

Modal-based forced response with vibro-acoustic coupling (Acoustics BEM)

Scenario-based post-processing

Look up more details

Infinite Plane dialog box (Acoustics BEM)

Acoustic Absorber dialog box

Forcing Frequencies dialog box (Acoustics BEM)

Solution dialog box (Acoustics BEM)

DBEM Acoustic, IBEM Acoustic, and IBEM Vibro-Acoustic Output Requests dialog boxes (Acoustics BEM)

Automatically Matched Layer dialog box

Acoustic Results / Panel Contribution / Panel Partial Sum Contribution / Maximum Analysis Frequency dialog box

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Acoustics BEM solver environment, Simcenter 3D 2021.1 Series

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