Replies: 8 comments 4 replies
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Z_REF is relative to GROUND_LEVEL (default is 0 m) |
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Thank you, based on the example provided, does it make sense to adjust the GROUND_LEVEL variable to 1m? Would there be issues otherwise? |
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For a domain that is 10 m high, I wonder why you are using M-O theory or profiles. Is this a wind tunnel you are looking at? We typically make |
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My domain is much larger, this is just an example to make it easier to discuss. |
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OK, but when we implemented the M-O profiles, we may have made some assumptions about the size of the domain. For example, surface |
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Okay, if my domain is 63 m high, what method do you recommend for implementing a velocity profile? |
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I like M-O profiles for relatively flat terrain where the external lateral boundaries are sufficiently far from the "action" to allow the flow over terrain or obstructions to develop naturally. How far away is hard to say. Just keep in mind that with M-O you forcing the wind to have a certain temperature and velocity profile at the upstream boundary. These profiles are based on an assumption that the upstream terrain is of a certain roughness and temperature relative to the air stream. All this being said, I think it is better to specify a |
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I am creating an issue. |
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To whom it may concern,
Is z_ref taken in absolute or relative terms, eg if the domain is -5m to 5 m in the z direction and there are obstructions from -5 m to 1 m representing the ground and I have a wind value at z = 2m, would the Z_ref in this case be 2m in absolute terms or 1m relative to the obstructions that make up the ground or maybe 7m as it would be relative to the z-min of the domain? The user's guide indicates "If Z_REF is not specified, it is assumed that the wind speed is taken at a height 2 m off the ground." What is "off the ground" relative to?
Best Regards,
Sal
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