Combining CFD calculations with local government standards

SXA · September 3, 2017, 20:44

Hi,

I am currently an undergraduate student doing my undergraduate thesis. I'm planning to create a CFD analysis tool that incorporate the local government standard's calculations. However, I am having some problems that is not related to the CFD programming.

I'm an architecture student with no prior knowledge of wind engineering and I just wanted to ask, in what condition is the wind speed taken at the height of z instead of its referenced height (h)? Thank you. Your help will be very much appreciated.

ashokac7 · September 6, 2017, 01:55

Your question is not clear enough. In CFD you have initial conditions and then you calculate the results. At present you can not give it final results and then it calculates the required initial value. Please explain your question.

Arjun_kalkur · September 6, 2017, 02:12

Guessing that you're talking about the potential head, in terms of wind engineering, potential head is usually considered when you want to calculate the speed at a particular height above the reference level, say for a wind mill placed at the peak of a mountain, the reference is ground, you will have to consider the z distance ie the potential head in equations like Bernoulli's equation.

SXA · September 6, 2017, 08:08

Quote:

Originally Posted by ashokac7

Your question is not clear enough. In CFD you have initial conditions and then you calculate the results. At present you can not give it final results and then it calculates the required initial value. Please explain your question.

Hi Ashok,

For my question, I was a bit confused with when the value of wind speed is taken at another height besides the referenced height (h) in wind engineering. Because I just looked at a local government standard and it stated that in certain situations, the value of wind speed is taken at height (z). But it didn't mention in what condition it would be taken at that height.

SXA · September 6, 2017, 08:11

Quote:

Originally Posted by Arjun_kalkur

Guessing that you're talking about the potential head, in terms of wind engineering, potential head is usually considered when you want to calculate the speed at a particular height above the reference level, say for a wind mill placed at the peak of a mountain, the reference is ground, you will have to consider the z distance ie the potential head in equations like Bernoulli's equation.

Hi Arjun,

Thank you very much for your explanation. It is very helpful. If I may ask further, besides the conditions that you mention, are there other conditions that leads to the value of wind speed taken at height z? Do you have any book recommendation for explanations for this?

Arjun_kalkur · September 6, 2017, 10:20

To speak in terms of wind engineering, I do not know if there are any conditions, but I have heard that for a wind mill, they consider the height above sea level to estimate the wind speed. Any book of fluid mechanics, specially bernoulli's principle would be good to understand potential head and when they are considered.

September 3, 2017, 20:44	Combining CFD calculations with local government standards	#1
SXA New Member Sarah Join Date: Sep 2017 Posts: 6 Rep Power: 8	Hi, I am currently an undergraduate student doing my undergraduate thesis. I'm planning to create a CFD analysis tool that incorporate the local government standard's calculations. However, I am having some problems that is not related to the CFD programming. I'm an architecture student with no prior knowledge of wind engineering and I just wanted to ask, in what condition is the wind speed taken at the height of z instead of its referenced height (h)? Thank you. Your help will be very much appreciated.

September 6, 2017, 02:12		#3
Arjun_kalkur New Member Arjun Kalkur Join Date: Sep 2017 Posts: 12 Rep Power: 8	Guessing that you're talking about the potential head, in terms of wind engineering, potential head is usually considered when you want to calculate the speed at a particular height above the reference level, say for a wind mill placed at the peak of a mountain, the reference is ground, you will have to consider the z distance ie the potential head in equations like Bernoulli's equation. SXA likes this.

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September 6, 2017, 01:55		#2
ashokac7 Senior Member Ashok Chaudhari Join Date: Aug 2016 Location: Pune, India Posts: 260 Rep Power: 10	Your question is not clear enough. In CFD you have initial conditions and then you calculate the results. At present you can not give it final results and then it calculates the required initial value. Please explain your question.

September 6, 2017, 10:20		#6
Arjun_kalkur New Member Arjun Kalkur Join Date: Sep 2017 Posts: 12 Rep Power: 8	To speak in terms of wind engineering, I do not know if there are any conditions, but I have heard that for a wind mill, they consider the height above sea level to estimate the wind speed. Any book of fluid mechanics, specially bernoulli's principle would be good to understand potential head and when they are considered.