Tips & Tricks

Can I extract results when running VA One on Linux?

Can I extract results when running VA One on Linux?, Yes, here is few options: 1. One way to do this is to execute a QuickScript on Windows, while leaving the va1 file on Linux. Eg. solve on the Linux box, and run a QS script on Windows to extract the results, while working on a Linux file system (no need to shuffle the file over). This requires no extra license, but one needs to write the script. Eg: solver file.va1 vaone -script export_script.ebs

How does VA One calculate damping from NCT?

The equation can be found in reference [1] as Eq. (21), in which • T+U ~ 2T = 0.5*m*|v|^2, where m is the mass per unit area of the SEA panel. • Pdiss = 0.5*Re{z}*|v|^2, where z is the impedance of the base of the trim. In the ratio, the wave magnitude |v| disappears and one is left with eta = Re{z}/(omega*m).

Defined absorption in VA One FEM/BEM

Can I add user defined absorption in VA One FEM/BEM?, Yes, this application of User Defined Impedances to Surfaces of BEM Fluids and FE Acoustic Cavities is implemented in VA One 2007.5

What is the size of stack space available for a compiled and uncompiled Quick Script?

In VA One 2010 the stack size for uncompiled is 8192 bytes, for compiled is 2048 bytes. In VA One 2010.5 the stack size will be 8192 bytes for both compiled and uncompiled scripts.

How do I apply a discrete velocity/acceleration constraint to an FE subsystem?

An acceleration or velocity constraint can be applied to the node of an FE subsystem using the "large mass method".

How does licensing of beta versions of VA One work?

How does licensing of beta versions of VA One work?, Beta versions of VA one require a license with...

How can I get an accurate Radiation Loss Factor to use in my SEA model?

One can use a hybrid model with an FE subsystem with an FE face connected to a SIF, and calculate the radiation efficiency. From this the radiation loss factor can be calculate

New VA One 2014.5 variables

Which are the new variables introduced in VA One 2014.5? VAONE_USE_PARDISO_SOLVER=1 VAONE_LJ_ANGLE_FIX VAONE_LJ_HERMITIAN_FIX VAONE_REPORT_LJ_ANGLE_FIX

Does VA One SEA use cached data when solving in batch mode?

Yes. With a .va1 as input to the batch solve, VA One SEA will use the CLF's cached in that .va1 if they exist. However, when passed a .ntf or .xml file VA One SEA solves from scratch each time.

Using pinned/simply supported BC in FE to compare to SEA

Why do I need to use pinned/simply supported BC in FE to compare to SEA?, Most, if not all, SEA theory is developed using an assumption of simply supported plates ...