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Overset Mesh is one of the coolest technologies in STAR-CCM+ as it allows objects to move around your computational domain freely without tying your mesh in knots, be that an overtaking car, an excavator arm, or the complex multiple motions involved in a production line. The motion does not even have to be prescribed, the Dynamic Fluid Body Interaction (DFBI) model allows you to solve for motion, in six degrees of freedom or less, based on the forces and moments acting on a body, such as a boat on a free surface, or a ball in a ball valve. To date, however, there has been one major constraint when using Overset Mesh, namely that all gaps had to be resolved with at least 2-4 cells, however small the gap, for Overset Mesh to work correctly. This limitation meant that for some cases with very small gaps, users had to choose between excessive cell counts or increasing the gap size in an unphysical manner.

No Need to Mind the Gap

The upcoming release of STAR-CCM+ v9.06 removes that constraint with the introduction of gap handling for Overset Mesh via the new “Zero Gap” Interface type.

So, show of hands, who has wrapped a surface and asked: "This surface is clean, why do I have to wrap it?".

The good news is that a new method introduced in STAR-CCM+ v9.06 will allow you to selectively wrap dirty surfaces, while preserving those that are clean.

Partial Surface Wrapping Schematic

지난 블로그 포스팅에서는 최적 설계 도구의 향상된 기능에 대해 언급하였습니다. STAR-CCM+ v9.06에서는 형상의 변형을 파라미터 없이 자유현상으로 더 쉽게 수행하기 위해 격자 몰퍼의 사용성을 향상시킴으로써 최적 설계의 다른 측면을 위해 힘써 왔습니다.

올 초, 우리는 몰퍼를 사용해 형상의 모양을 변형시킬 수 있는 격자 변형 모델을 출시하였습니다. 이는 CAD 데이터 원본을 이용할 수 있을 뿐만 아니라, 실제 소프트웨어에서 그것을 수정하기 위한 중요한 기능입니다.

Control points illustrate potential improvements

What is the common element in solving problems such as vortex induced vibrations, mixing in unconventional geometries, estimating separating efficiency of cyclones, refractory damage in sulfur recovery furnace or accurately calculating performance of pumps?
Chemical and Oil & Gas Conference Houston 2014

Three clever engineering students recently came up with a design for a bike that can't be stolen, well... at least can't be resold again as the same said bike. The idea is that the lock doubles as an intergral part of the frame. Any attempts to cut the lock would effectively make the bicycle unrideable. While there are still some issues to hammer out - like what happens if the owner loses the key, who do you keep the wheels from being stolen, and what about how the bike itself rides? Of course if someone wants to steal the bike just for scrap metal - all bets are off. Still a cool idea...

Unstealable bike

I’m a control freak. Give me some reports, and I’ll use every single one of them to know everything and anything about my simulation. Well, what if the pressure all of a sudden spikes up uncontrollably? Must mean that something should be verified in my simulation, perhaps I didn’t use the right cell size, and well who knows, my results may turn for the worst, be wrong, and my gradually slowly building up reputation of a serious design engineer, not only Dr Mesh "knows how to fix your cells”, would be down the drain in an instant!

Pub Lunch!

From bridges made of pasta, to 'grow-it-yourself' brains, Brigid looks behind the headlines to bring you the latest Engineering News.

Spaghetti Bridge - image courtesy of Michelle Lowry

When my son graduated from University a few years ago with his shiny new degree in Accounting, he was eager to land his first “real job.” One that didn’t involve wearing a paper hat or asking if you’d like fries with that.

After a several interviews it became clear that he was lacking a key skill that most hiring managers were looking for: exposure and/or experience with the commercial software the company was using for their accounting process. It was shocking to learn that he had never been exposed to any of the commercial tools that are heavily used in the industry for which he was preparing to enter. Although he graduated with a strong understanding of accounting principles, future employers expected that knowledge to be coupled with hands-on experience with their standard tools.

Ah, summer holidays, the beach, the sun, brain-matter replaced from thoughts of velocities, pressures and optimizations with pina coladas… Except that I went camping close to a river. Of course, you know what happens when a CFD engineer watches a river for too long? He sees streamlines, algae flowing around bridge pillars in neat flow paths, and immediately spots a leaf following the path of least resistance… and wonders what the residence time of that leaf is. So this all got me thinking about work again.

Wild River image

Before I left for my holidays, I was trying to showcase the recirculation zones in our latest invention. Nothing would portray them as badly as I felt they were. I tried vectors, I tried streamlines, I tried scalars and overlaying various field functions on various derived parts. Nothing would do it. I'm not a Colorful Fancy Designer, I'm Dr Mesh and my speciality is meshing, so I really need to learn about these post-processing things. I read with eagerness the posts from Matthew Godo.

I ran across an article the other day that made me, ahem... perk up. CFD was used to simulate roasting coffee beans! Coffee is something I know AND care about. But why would CFD be needed for something as "non-techie" as roasting beans? Like everything else under the sun, it comes down to plain ol' chemistry. The final flavor profile of the bean will vary widely based on temperature and roast time.

Obnoxious Latte

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Brigid Blaschak
Communications Specialist
Dr Mesh
Meshing Guru
Stephen Ferguson
Communications Manager
Tammy de Boer
Global Academic Program Manager
Sabine Goodwin
Senior Engineer, Technical Marketing
Joel Davison
Product Manager, STAR-CCM+
Matthew Godo
STAR-CCM+ Product Manager
Prashanth Shankara
Technical Marketing Engineer