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Cadence saves a telecom design with Coolit.

Courtesy of Tality Corp.

At Cadence Design Systemsí subsidiary, Tality Corp., prototype testing exposed large recirculation zones within a customerís telecommunications system. The unexpected results came after flow analyses, provided by an outside consultant using CFdesign, had failed to identify any potential problems.

Having spent thousands of dollars and weeks getting a wrong answer, Tality needed a quick way to recoup if it were to meet its tight delivery schedule. A magazine article pointed Tality toward Coolit, and after a rapid ramp-up and brief trial, engineers attacked the problem, identifying the flow patterns, pinpointing stagnation zones and then modeling baffle arrangements that would fix the problem.

A single CFdesign analysis for only one slice through the chassis took approximately 1 to 1-1/2 days to build and mesh, and another 24 hours to run. Coolit required only two hours total: one hour to model the entire system and one hour to run the calculations. And follow-on prototype testing verified that the Coolit predictions did, indeed, match the real life results.

After having been bitten by its initial FEA chassis predictions, engineers decided it would be prudent to revisit the board level analyses. Here, Coolit predicted that the boards, though close to their limits, would perform as required. Again, Tality verified the Coolit predictions against measurements; the four boards matched actual results to within 2%, 5%, 7%, and 10%, respectively (engineers believe the latter number reflects an erroneous power input assumption provided by the customer).

A Coolit thermal model.
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