Difference between thermophysicalProperties and transportProperties in OpenFoam

ashrujit · January 24, 2020, 07:56

Hello.

I am new to OpenFoam and CFD as well. In some tutorial cases (I am using buoyantPimpleFoam), in 'Constant' folder there is 'thermophysicalProperties' file present and sometimes 'transportProperties' file present. And sometimes both the files are present.

[ In OpenFoam version 7, buoyantPimpleFoam folder - 'BernardCells' case has both the files present. But 'hotRoom' and 'hotRoomBoussinesq' cases have only 'thermophysicalProperties' file present. ]

Can anyone please explain the differences please? Which file to use for which cases?

Thanks in advance.

clapointe · January 24, 2020, 09:11

Some time ago the buoyantPimpleFoam and buoyantBoussinesqPimpleFoam solvers (as well as the simple variants) were combined. Previously, using the boussinesq variant required a number of thermophysical constants to be read -- from transportProperties. Since then a new Boussinesq equation of state handles thermophysical properties instead of computing them inside the solver with properties read from transportProperties. So my first guess is that the "transportProperties" file in the BernardCells tutorial is leftover from when it was once used and is now redundant. This can be tested by removing the transportProperties file from the tutorial and trying to run it (indeed, I've tested this theory and found it to be true -- you can as well).

Caelan

ashrujit · January 24, 2020, 09:46

Thank you so much for the explanation. It helped a lot to clarify things. Much appreciated.

January 24, 2020, 07:56	Difference between thermophysicalProperties and transportProperties in OpenFoam	#1
ashrujit New Member santi Join Date: Jan 2020 Posts: 3 Rep Power: 6	Hello. I am new to OpenFoam and CFD as well. In some tutorial cases (I am using buoyantPimpleFoam), in 'Constant' folder there is 'thermophysicalProperties' file present and sometimes 'transportProperties' file present. And sometimes both the files are present. [ In OpenFoam version 7, buoyantPimpleFoam folder - 'BernardCells' case has both the files present. But 'hotRoom' and 'hotRoomBoussinesq' cases have only 'thermophysicalProperties' file present. ] Can anyone please explain the differences please? Which file to use for which cases? Thanks in advance.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
OpenFOAM - Validation of Results	Ahmed	OpenFOAM Running, Solving & CFD	10	May 13, 2018 18:28
Extrusion with OpenFoam problem No. Iterations 0	Lord Kelvin	OpenFOAM Running, Solving & CFD	8	March 28, 2016 11:08
OpenFOAM Foundation releases OpenFOAM® 3.0.0	CFDFoundation	OpenFOAM Announcements from OpenFOAM Foundation	1	November 7, 2015 15:16
Superlinear speedup in OpenFOAM 13	msrinath80	OpenFOAM Running, Solving & CFD	18	March 3, 2015 05:36
Comparison of axisymmetric case, Starccm+ and OpenFOAM	linnemann	OpenFOAM Running, Solving & CFD	12	June 16, 2011 05:43

January 24, 2020, 09:11		#2
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 14	Some time ago the buoyantPimpleFoam and buoyantBoussinesqPimpleFoam solvers (as well as the simple variants) were combined. Previously, using the boussinesq variant required a number of thermophysical constants to be read -- from transportProperties. Since then a new Boussinesq equation of state handles thermophysical properties instead of computing them inside the solver with properties read from transportProperties. So my first guess is that the "transportProperties" file in the BernardCells tutorial is leftover from when it was once used and is now redundant. This can be tested by removing the transportProperties file from the tutorial and trying to run it (indeed, I've tested this theory and found it to be true -- you can as well). Caelan

January 24, 2020, 09:46		#3
ashrujit New Member santi Join Date: Jan 2020 Posts: 3 Rep Power: 6	Thank you so much for the explanation. It helped a lot to clarify things. Much appreciated.