Tips & Tricks

What is the recommended mesh density for RAYON BEM and FMM BEM?

For standard BEM one can start with 6-8 elements, and refine from there. For collocation (used by the FMM solver) the guideline should be 6 to 10 elements.

Workaround for using VPS 2014 DMP modal data in VA One (internal)

It is possible to export the modes in erfh5 format of type 1. You have for that to setup the following environment variable: PAM_OCTRL_ERFVERSION=1 PSM is much faster than BLOCK_IRAM.

What is the GUI process when creating a manual point junction?

the process in the GUI, when creating a manual point junction is as follows ...

Difference between using an external vs. internal FE solver in VA One

In brief, what’s the difference between using an external vs. internal FE solver in VA One? The background is that VA One is using structural modes for FE and for FE/SEA hybrid. These modes can come from two sources: - Internal VA One Solver - External solver (NASTRAN, ANSYS, ABAQUS etc.)

How to manually set the megawords variable in Rayon?

The megaword variable can be set by specifying the value at the end of the irpoc line in the startrayon.bat file:

Can I set RAYON to solve in batch using a script in VA One?

There is no API call for launching BEM runs ...

How do I run the RAYON solver in Linux?

To solve for intermediate BEM results, set the solve options to write out files from VA One. The log window will contain information about where the files are written, MODEL name, and BEM FLUID names,

Difference in subsystem properties for a mirrored ribbed singly curved shell

Why is there a slight difference in subsystem properties for a mirrored ribbed singly curved shell? The reason is that the normal of the singly curved shell is flipped,

How does VA One SEA calculate the power from TBL?

In the calculation of the power input, the calculated or user-defined pressure is the band-integrated mean-square pressure, whilst the other TBL parameters, decay coefficients, convection wavenumbers, free flow velocity etc., are used to calculate the narrowband spatial correlation function which is used in determining the joint acceptance

Extending the FMM kD range

This is currently (VA One 2009) limited by the software. Two possible options (that we could consider for the future)...