Navier-Stokes equation or Navier-Stokes equations

Takaaki · November 14, 2009, 12:26

Which is correct, "Navier-Stokes equation" or "Navier-Stokes equations?"
There is a large number of people who use plural form for this equation.
With regard to "energy equation," most people use singular form.
Does anyone know the reason?

sbaffini · November 14, 2009, 13:50

The "Navier-Stokes equations" are 3 equations, one for each momentum component. Some people also use this term to indicate the 3 momentum equations + the energy equation

Takaaki · November 14, 2009, 14:11

Dear sbaffini,
Thank you for your prompt reply.
I understand the reason.

November 14, 2009, 12:26	Navier-Stokes equation or Navier-Stokes equations	#1
Takaaki New Member Takaaki Kono Join Date: Nov 2009 Posts: 2 Rep Power: 0	Which is correct, "Navier-Stokes equation" or "Navier-Stokes equations?" There is a large number of people who use plural form for this equation. With regard to "energy equation," most people use singular form. Does anyone know the reason?

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November 14, 2009, 13:50		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,191 Blog Entries: 29 Rep Power: 39	The "Navier-Stokes equations" are 3 equations, one for each momentum component. Some people also use this term to indicate the 3 momentum equations + the energy equation

November 14, 2009, 14:11		#3
Takaaki New Member Takaaki Kono Join Date: Nov 2009 Posts: 2 Rep Power: 0	Dear sbaffini, Thank you for your prompt reply. I understand the reason.