Typo in CFD-Direct Energy equation

Tobi · February 1, 2017, 16:20

Dear all,

at the moment I am checking the units of the energy equation here: http://cfd.direct/openfoam/energy-equation/ ... however, the kinetic energy is given in units of per unit mass while the internal energy is given in units of per unit volume. Based on the terms, the internal energy should also be per unit mass otherwise the units will not fit. Can someone confirm that? Why I was checking it... I am checking the units of my equations in my book and I found some unit problems.

khedar · February 1, 2017, 22:04

I think it is a mistake. "specific" of any physical quantity is normally per unit mass and not volume. See here also

https://en.wikipedia.org/wiki/Specific_energy

cfd.direct · March 6, 2017, 04:42

It was an error, it is corrected now (will take a few hours for cache to clear).
Please contact us directly next time, we cannot be in all places at once:
https://cfd.direct/contact/

February 1, 2017, 16:20	Typo in CFD-Direct Energy equation	#1
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Bad Wörishofen Posts: 2,711 Blog Entries: 6 Rep Power: 52	Dear all, at the moment I am checking the units of the energy equation here: http://cfd.direct/openfoam/energy-equation/ ... however, the kinetic energy is given in units of per unit mass while the internal energy is given in units of per unit volume. Based on the terms, the internal energy should also be per unit mass otherwise the units will not fit. Can someone confirm that? Why I was checking it... I am checking the units of my equations in my book and I found some unit problems. __________________ Keep foaming, Tobias Holzmann

March 6, 2017, 04:42		#3
cfd.direct New Member cfd.direct Join Date: Apr 2015 Posts: 23 Rep Power: 11	It was an error, it is corrected now (will take a few hours for cache to clear). Please contact us directly next time, we cannot be in all places at once: https://cfd.direct/contact/ Tobi likes this.

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February 1, 2017, 22:04		#2
khedar Senior Member khedar Join Date: Oct 2016 Posts: 111 Rep Power: 10	I think it is a mistake. "specific" of any physical quantity is normally per unit mass and not volume. See here also https://en.wikipedia.org/wiki/Specific_energy