12-10-2021, 01:31 PM
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#81 (permalink)
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I question the veracity of the false color around the stagnation point. In the top view, the two outer thirds; and in the elevation the sharp gradient at the top and bottom.
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12-13-2021, 11:40 AM
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#82 (permalink)
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Odd front fascia............
In Wolf H. Hucho's 2nd-Edition, he had a schematic rendering of such a feature.
It had to do with yaw-moment in crosswind and gust.
If memory serves me, in zero-yaw flow, the leading edges will provide for full flow attachment, since it's all in a favorable pressure gradient, moving towards low pressure.
In quartering crosswind, or gust, the structure acts as a burst edge, to force separation, which, otherwise, might allow bistable 'hunting' of the air beyond the nose, and potential stability issues from a larger, low leeward pressure- induced understeer.
I don't have my book with me. We'd want to double-check.
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12-13-2021, 11:46 AM
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#83 (permalink)
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veracity
Quote:
Originally Posted by freebeard
I question the veracity of the false color around the stagnation point. In the top view, the two outer thirds; and in the elevation the sharp gradient at the top and bottom.
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We're looking at a centerline section of the flow. Two-dimensional, in a 3-dimensional field.
Is this 'University-grade' CFD? Like Dassault's Exa Powerflow, running on a 120-core processor?
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04-21-2022, 06:42 AM
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#84 (permalink)
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Cool TUM Technical University of Munich study of ID3 containing details about the battery performance and energy consumption levels. https://www.sciencedirect.com/scienc...133?via%3Dihub |
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04-21-2022, 12:50 PM
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#85 (permalink)
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Drag-whispering a ID3 boat-tail
According to the EPA, the closest streamline filament shown along the top of the CFD image of the VW would be your first-principle shape for body elongation.
The 'blue' region is bordered by it.
Wind tunnel smoke -flow imaging of the VW XL1 bears it out, as the closest filament remains fully-attached to the upper body for the entire length of the body, along the streamlined contour.
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