George Laird's blog

LSTC Releases LS-DYNA R11.0.0

LSTC Releases LS-DYNA R11.0.0Livermore Software and Technology Company (LSTC), Livermore, CA has recently released LS-DYNA R11.0.0. This release is ready-to-use and is our baseline at Predictive for implicit and explicit work. It is stable and is not a classic xx.0.0 release as is common in the software industry.

Let me explain why: LSTC’s is very transparent about how it develops LS-DYNA and any published release (see release notes.)

So what does this really mean? A released LS-DYNA version is not a “fresh, hot-out-of-the-developers-oven” version of the code. It has gone through months and months, if not years of bug fixes by the development team and user community. The process is quite rigorous, for example, once the LSTC team decides enough-is-enough, a branch is somewhat sealed off from any new major code changes (i.e., R11.xxxxx). While this branch is static, the Development Team continues code development under the designation of Dev_XXXXXX. As the code is fine-tuned and bugs removed, applicable updates are made to the branch and if applicable to prior released versions of the code. At this stage, if the code is deemed ready by the Team, it is run through a suite of verification problems and released to the simulation community. One will note that through-out this whole process, there is no VP of marketing or sales pushing the team to release, it is only released when it is right.

Why LS-DYNA R11.0.0?

CFD Analysis of CRRC's LACMTA Heavy-Rail Rapid Transient Vehicle

This has been an on-going project for our CFD consulting services team during most of 2018. As we all know, there is nothing like a “site visit” to meet your fellow engineers and see hardware. In early September, Drs. Laird and Hearn visited the CRRC Changchun Railway Vehicles Co., Ltd in Changchun, China. This is a cooperative project where Predictive has partnered with Hengstar Technology, Shanghai, China (Dr. Lu Hongsheng is shown on the left of our group photo). The project work requires a complete flow and thermal analysis of Los Angeles County Metropolitan Transportation Authority (LACMTA) new passenger transit vehicle. The CFD requirements are a notch above normal specifications with tight controls on air flow volume, maximum velocity and distribution. Thermal analysis looks at vehicle cool down on hot days (transient thermal with solar radiation and lots of internal heat generation) and also thermal management within the electronics and motor drive bay at bogie level.  All simulation work will be validated against vehicle mock-ups.

 

Changchun, China – CRRC’s Manufacturing Site

CFD Analysis of CRRC’s LACMTA Heavy-Rail Rapid Transient Vehicle 01

CRRC’s Bullet Train

STAR-CCM+ CFD HVAC Flow Analysis of Passenger Transit Vehicle

China News - LS-DYNA Implicit Class

LS-DYNA is historically known as the world's best explicit analysis code or the leader in the finite element analysis of nonlinear transient events. During the last ten years, LSTC (the manufacturer of LS-DYNA) has heavily invested in the development of its implicit anlaysis capabilities. Today, LS-DYNA can seamlessly handle complex, nonlinear analyses from static (implicit) to transient (explicit). Predictive Engineering has developed training course materials that covers both the implicit and explicit sides of the code. It was with pleasure that we taught a course in Shanghai, China to 27 students from industry and academia. This three day LS-DYNA training course was focused on LS-DYNA's implicit analysis capabilities from linear, elastic static stress analysis to static nonlinear analysis to fully, transient nonlinear analysis. The course finished with a half-day training on the linear dynamics capabilites of LS-DYNA.

 

Predictive Engineering LS-DYNA Implicit Class Photo - Shanghai China September 5-7 2018

 

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