configure "effective roughness height"

RAFFAELA GERMANO · October 30, 2017, 23:01

I am configuring the "wind" object and am having doubts about the configuration of the roughness. Is it necessary to configure "effective roughness height" even though you have already set up "reference height" and "power law index"? or can I consider the default? can anybody help me? thanks.

RD-CHAM · November 1, 2017, 06:37

Hi Raffaela,

Yes it is necessary, the effective roughness height sets the roughness height at the edge of the domain, this will change depending on what type of surface is in front of the buildings you are analyzing. Whereas the reference height sets the height at which the Wind Speed is specified.

Please see the user manual http://www.cham.co.uk/phoenics/d_pol...-type.htm#Wind for more details on all PHOENICS objects.

RAFFAELA GERMANO · January 25, 2018, 14:50

thank you!

RAFFAELA GERMANO · January 30, 2018, 09:09

I'm trying to set up the porosity of the objects using the porosity field available in the "lock attributes" item, but then I add the value 0.25 and put it to save the modification that the program does not save. I wonder why the program is not saving.

October 30, 2017, 23:01	configure "effective roughness height"	#1
RAFFAELA GERMANO New Member RAFFAELA Join Date: Oct 2017 Posts: 3 Rep Power: 7	I am configuring the "wind" object and am having doubts about the configuration of the roughness. Is it necessary to configure "effective roughness height" even though you have already set up "reference height" and "power law index"? or can I consider the default? can anybody help me? thanks.

January 30, 2018, 09:09	(Phoenics CFD) porosity configure.	#4
RAFFAELA GERMANO New Member RAFFAELA Join Date: Oct 2017 Posts: 3 Rep Power: 7	I'm trying to set up the porosity of the objects using the porosity field available in the "lock attributes" item, but then I add the value 0.25 and put it to save the modification that the program does not save. I wonder why the program is not saving.

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November 1, 2017, 06:37		#2
RD-CHAM New Member Join Date: Sep 2017 Posts: 9 Rep Power: 7	Hi Raffaela, Yes it is necessary, the effective roughness height sets the roughness height at the edge of the domain, this will change depending on what type of surface is in front of the buildings you are analyzing. Whereas the reference height sets the height at which the Wind Speed is specified. Please see the user manual http://www.cham.co.uk/phoenics/d_pol...-type.htm#Wind for more details on all PHOENICS objects.

January 25, 2018, 14:50		#3
RAFFAELA GERMANO New Member RAFFAELA Join Date: Oct 2017 Posts: 3 Rep Power: 7	thank you!