30. Creating a Region Path: Main menu > Preprocessing > Region Assembly > New Region

31. Attaching/detaching Entities to/from a Region Path: Main menu > Preprocessing > Region Assembly > Attach/Detach

32. Internal Points Internal points are used to calculate the problem unknowns in the interior of the domain, after the solution on the boundary has been calculated. An internal point consists of three spatial coordinates (X, Y,Z) indicating its location, a unique identification number (id) and the values of the unknown fields of the problem at that location. It is displayed as a dot in the canvas of the ISoBEM graphical user interface. Internal point functionality can be accessed from the main menu, under the path Preprocessing > Internal Points. The supported functions for the internal points are the creation in various ways, the modification and the deletion as well as merging, reflecting and renumbering. Path: Main menu > Preprocessing > Internal Points > Create

33. Load Cases Path: Main menu > Model & Solving > Load Case Editor A load case contains a set of regions, the basic time parameters of the problem, and the corresponding boundary conditions. different load cases can be created, addressing different region configurations, different time options and different boundary conditions. However, only one load case can be active. New Create a new load case. Edit Modify an existing load case. Delete Delete an existing load case. Duplicate Create a duplicate entry of an existing load case. Renumber Renumber all the existing load cases. Set Active Set the selected load case as active.

34. Load Cases For each material type, the field T and U represent different field. For a detailed list of the fields see Table

35. Load Cases Time Dependency The time dependency of the load case. The following options are available: Static/Steady state For static or steady state problems. Harmonic In the case of harmonic problems additional information is required. Specifically, if only one frequency is to be solved, it has to be specified here. Otherwise, if more the one frequencies are desired, a frequency table has to be specified. Time Domain If the time dependency of the model is set to time domain, the preferred numerical method and its corresponding parameters must be set. Available numerical methods for time domain problems are: Exponential FFT Rectangular FFT Finite Differences Humboldt

36. Load Cases

37. Boundary Conditions Path: Main menu > Model & Solving > Active Load Case > Boundary Conditions Boundary conditions are applied in the context of the active load case. Each load case has its own boundary conditions. In order to apply boundary conditions to a load case it must be set as Active first.

40. Time Functions Path: Main menu > Model & Solving > Define Model > Functions/Tables > Time Functions The time functions are a tool that has been introduced to allow the user to insert time dependent boundary conditions in time domain problems. Each time function has a unique id, a name, a duration in seconds, a number of time steps and a number of value sets. Each value set represents a set of values, one for each time step of the function. One can assign more than one value sets to each time function without having to redefine the duration and the number of time steps of the function.

41. Time Functions Path: Main menu > Model & Solving > Define Model > Functions/Tables > Frequency Tables

42. Waves Path: Main menu > Preprocessing > Waves > Wave Editor In order to model wave phenomenal in elasticity, electromagnetism and acoustics, ISoBEM supports a variety of waves. The wave machinery can be accessed from the Wave Editor, under the path Preprocessing > Waves > Wave Editor.... New Creation of a new wave. Edit Editing an existing wave. A wave can also be edited by double clicking on it. Delete Deletion of the selected wave. Duplicate Duplication of the selected wave with different id. Renumber The ids of the waves can be reset by pressing Renumber.

43. Waves Path: Main menu > Preprocessing > Waves > Wave Editor When creating or editing a wave, several parameters of the wave must be specified. The wave id and name, its dimensionality (2D in-plane, 3D, axisymmetric), the type of region it is propagating in (Linear Elastic, Acoustic, Electro- magnetic), the type of the wave (plane, spherical) and the kind of the wave (Longitudinal or shear)