computer science

Numerical Wind Tunnel

Numerical Wind Tunnel is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Numerical Wind Tunnel rather than just read about it. In short: Numerical Wind Tunnel (数値風洞) was an early implementation of the vector parallel architecture developed in a joint project between National Aerospace Laboratory of Japan and Fujitsu. It was the first supercomputer with a sustained performance of close to 100 Gflop/s for a wide range of fluid dynamics application programs.

Key takeaways

Numerical Wind Tunnel belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Numerical Wind Tunnel to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Numerical Wind Tunnel from memory before moving on to harder problems.

Reference excerpt

Numerical Wind Tunnel (数値風洞) was an early implementation of the vector parallel architecture developed in a joint project between National Aerospace Laboratory of Japan and Fujitsu. It was the first supercomputer with a sustained performance of close to 100 Gflop/s for a wide range of fluid dynamics application programs. It stood out at the top of the TOP500 during 1993-1996. With 140 cores, the Numerical Wind Tunnel reached a Rmax of 124.0 GFlop/s and a Rpeak of 235.8 GFlop/s in November 1993. It consisted of parallel connected 166 vector processors with a gate delay as low as 60 ps in the Ga-As chips. The resulting cycle time was 9.5 ns. The processor had four independent pipelines each capable of executing two Multiply-Add instructions in parallel resulting in a peak speed of 1.7 Gflop/s per processor. Each processor board was equipped with 256 Megabytes of central memory.

References

Worked examples

Example 1 — a first encounter with Numerical Wind Tunnel

Start with the simplest possible case. Write down what Numerical Wind Tunnel claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Numerical Wind Tunnel before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Numerical Wind Tunnel ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Numerical Wind Tunnel

In research: Numerical Wind Tunnel appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Numerical Wind Tunnel in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Numerical Wind Tunnel is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1993 in science, Computer-related introductions in 1993, Fujitsu supercomputers, so understanding it makes those chapters shorter.
In everyday life: Look for Numerical Wind Tunnel outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Numerical Wind Tunnel in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Numerical Wind Tunnel means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Numerical Wind Tunnel out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Numerical Wind Tunnel in simple terms?

Why does Numerical Wind Tunnel matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Numerical Wind Tunnel?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Numerical Wind Tunnel.