No Static Entropy Generation

gmingardo · February 11, 2017, 12:23

Hi everybody,
I'm doing a simulation at very low RE number (1e4) and very low velocity. the simulation is also with no heat exchange and incompressible flow, so I'm using the Isothermal model. In the solution there is no entropy rise, as the Static Entropy in the Post is 0 everywhere. However, the viscosity effects in the simulation are well captured, as I obtained a total pressure distribution verified with experiments. So basically everything seems to work, but the entropy is not calculated. Do you think it's a problem?
Thank you a lot,
Giacomo

turbo · February 13, 2017, 08:49

Consider the definition of entropy : dq=Tds.
Your isothermal condition falls to isentropic.

February 11, 2017, 12:23	No Static Entropy Generation	#1
gmingardo New Member Giacomo Mingardo Join Date: Jul 2016 Posts: 12 Rep Power: 9	Hi everybody, I'm doing a simulation at very low RE number (1e4) and very low velocity. the simulation is also with no heat exchange and incompressible flow, so I'm using the Isothermal model. In the solution there is no entropy rise, as the Static Entropy in the Post is 0 everywhere. However, the viscosity effects in the simulation are well captured, as I obtained a total pressure distribution verified with experiments. So basically everything seems to work, but the entropy is not calculated. Do you think it's a problem? Thank you a lot, Giacomo

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February 13, 2017, 08:49		#2
turbo Senior Member Join Date: Jun 2009 Posts: 174 Rep Power: 16	Consider the definition of entropy : dq=Tds. Your isothermal condition falls to isentropic.