A space for simulation related technical resources and discussions.
Radioss simulations which include Fluid-Structure Interaction with ALE formulation may stop with an error message indicating a negative or zero density issue, such as the following : MESSAGE ID : 167 ** STOP: NEGATIVE RHO=-1.4673475693963E-07 FOR 3D-ELEMENT ID=2882209 ERROR TERMINATION This may be due to multiple causes…
In this video we will examine how we can export 3D Geometry created in Autodesk® Revit® to a STEP file. By exporting to STEP we can then import that fully featured geometry into Altair's Inspire, SimSolid, Hypermesh and more, for a traditional FEA, or mesh-free simulation without the need for any geometry simplification.
This article describe the different types of joints available in Altair Radioss, through the /PROP/TYPE45. Figures 1 to 7 showcase these different joint types. Figure 1: Spherical Joint Figure 2: Revolute Joint Figure 3: Cylindrical Joint Figure 4: Planar Joint Figure 5: Universal Joint Figure 6: Translational Joint Figure…
In the present article the use of a spherical joint in Radioss and how to set it up in HyperMesh are presented. The spherical joint is a type of joint available within /PROP/TYPE45 (KJOINT2). The model created to showcase the use of the spherical joint and contains 3 identical cylindrical tubes. Figure 1 shows a brief…
This article provides a summary of the wave propagation models supported in WinProp for urban scenarios. An urban scenario is typically a built-up area, which could be a whole city, but also a suburban or residential part, a campus, factory, or similar environments. Each building or vegetation object is described by a…
On some multi-CPU Windows systems it could happen in some cases that not all of the CPUs (cores) are used by Feko in a parallel run. This could be observed even though the machines file and number of requested processes (cores) specify that all available cores should be used. For example, on a machine with 4 CPUs and 32…
Overview When a result is obtained with Feko a regular consideration arises as to the accuracy of the results. This article provides some guidelines for consideration. Results obtained with FEKO can be confirmed in the following ways: Compare with a measured result Check or modify the feed / excitation method Compare with…
Introduction RADAR (Radio Detection and Ranging) systems find their use across various sectors including military, aircraft and maritime navigation, space exploration, security surveillance, and more. In recent years, there has been a growing interest in its application within the automotive industry to mitigate road…
In HyperMesh we use the Element Quality view to review the element quality. To enable the Element Quality view, click on the View Controls toolbar and select Element Quality. If you want to check the time step for the model of an explicit analysis, you need a criteria file in which the time step criterion has been defined.…
The JOHNSON-HOLMQUIST-CONCRETE material law is a very interesting material law for concrete modeling, especially for defense applications. This material law has been implemented in Radioss V2024.1. This material law is available with the non-local regularization; this is particulary interesting to have mesh-independant…
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