News, Blogs and Updates

Formula 1 racing, CFD, and Wind Tunnels

HPC Wire has a great article on the rules for computational fluid dynamics and wind tunnel testing in Formula 1 racing. It's surprising to learn the sports' governing body restricts CFD usage to 25 teraflops. Racing directors have complained about the restrictions, feeling it inhibits the use of the best techology and pushes things back by ten years.

Restrictions are in place for wind tunnel usage as well, and some have advocated for moving entirely toward CFD-only testing. However, an analysis by one team principal didn't find a huge cost savings in doing away with wind tunnels, and predicts the money would merely shift to the CFD. As well the racing community would have a hard time seeing the phasing out of wind tunnels, a long-preferred tool for racing teams.

As for the CFD controls, some have proposed shifting the rules from restricting teraflops toward controling energy bandwidth, giving teams more freedom over their computing setups.

Read the full article: "Formula One Contemplates CFD-Only Future"

And for another read on the topic:

"Is an F1 wind tunnel ban realistic? Technical chiefs remain sceptical of change"

LS-DYNA: Observations on Composite Modeling

This is the 2nd in a series of informal articles about one engineer’s usage of LS-DYNA to solve a variety of non-crash simulation problems. The first was on LS-DYNA: Observations on Implicit Analysis, the third was LS-DYNA: Observations on Explicit Meshing, and the fourth was LS-DYNA: Observations on Material Modeling

My academic background is in micro-mechanics and I have a good understanding of how many angels can dance on the head of a pin. A lot of my academic work was on fracture mechanics from a theoretical aspect and whenever I got into the laboratory, it was often a crazy chase in trying to correlate real-world fracture behavior to numerical models. I find the same behavior in composites. Ask ten composite experts and one can get 20 opinions. We have a myriad of theories that I don’t even want to start mentioning. My favorite reference to the uncertainties of composite analysis is that of the World Wide Failure Exercise (WWFE) where brave scientists were given raw composite data and had to make failure predictions without having access to the experimental data. Given that they couldn’t curve fit or pick their preferred layups or whatever, the reality was that theory could match experiment within 20%. This really isn’t as bad as it sounds since experimental data has a typical range of 10%.

LS-DYNA: Observations on Implicit Analysis

This is the 1st in a series of informal articles about one engineer’s usage of LS-DYNA to solve a variety of non-crash simulation problems. The second was on LS-DYNA: Observations on Composite Modeling, the third was LS-DYNA: Observations on Explicit Meshing, and the fourth was LS-DYNA: Observations on Material Modeling

I’m doing more and more implicit work with LS-DYNA and would like to share some of my observations on its improvement over the last couple of years. You might be surprised how far Mortar Contact and linear dynamics (e.g., PSD and general NVH) have come. This article provides a quick little overview of what is happening with LS-DYNA implicit, some tips and tricks we have learned along the way, and resources that are available to sharpen up your skill set.

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