MODELISATION OF SEA WATER DENSITY CHANGES

August 14, 2001, 07:10

Hi all!

We need some advice on how to deal with density changes in the simulation of effluent discharges in sea water. Does anyone know the UDF to model the density of sea water as a function of temperature and salt concentration?

Thanks a lot!

August 16, 2001, 09:32

(1) The technical support at Fluent told me that a User-Defined-Function (UDF) can be used to define e.g. a temperature and concentration dependent density, as long as the density variations within the fluid are small. (2) Enable a User-defined-scalar for the salt concentration and solve the heat equation for the temperature. (3) The appropriate UDF for the calculation of density, C_R(c,t), is the DEFINE_PROPERTY. In this function you can easily get access to the temperature and the user-defined-scalar values (salt conc.) in all cells, see the UDF manual. (4) The Sea Water Equation of State is defined in UNESCO International Equation of State (IES 80), see e.g. http://fermi.jhuapl.edu/denscalc.html, the matlab routines on http://www.marine.csiro.au/~morgan/seawater/ , might also be helpful as a reference when you define your UDF.

Ola Nordblom

Nazir426 · June 11, 2012, 01:57

hi every one.
i want to model the sea states in FLUENT-13 but i have no idea of how to model it? Can anyone share with me the Basic tutorials?

waiting for yours positive responses...........

August 14, 2001, 07:10	MODELISATION OF SEA WATER DENSITY CHANGES	#1
Alex Fabregat Guest Posts: n/a	Hi all! We need some advice on how to deal with density changes in the simulation of effluent discharges in sea water. Does anyone know the UDF to model the density of sea water as a function of temperature and salt concentration? Thanks a lot!

August 16, 2001, 09:32	Re: MODELISATION OF SEA WATER DENSITY CHANGES	#2
Ola Nordblom Guest Posts: n/a	(1) The technical support at Fluent told me that a User-Defined-Function (UDF) can be used to define e.g. a temperature and concentration dependent density, as long as the density variations within the fluid are small. (2) Enable a User-defined-scalar for the salt concentration and solve the heat equation for the temperature. (3) The appropriate UDF for the calculation of density, C_R(c,t), is the DEFINE_PROPERTY. In this function you can easily get access to the temperature and the user-defined-scalar values (salt conc.) in all cells, see the UDF manual. (4) The Sea Water Equation of State is defined in UNESCO International Equation of State (IES 80), see e.g. http://fermi.jhuapl.edu/denscalc.html, the matlab routines on http://www.marine.csiro.au/~morgan/seawater/ , might also be helpful as a reference when you define your UDF. Ola Nordblom

June 11, 2012, 01:57	Modeling of Sea States in ANSYS-13	#3
Nazir426 New Member Nazir Join Date: Jun 2012 Posts: 8 Rep Power: 13	hi every one. i want to model the sea states in FLUENT-13 but i have no idea of how to model it? Can anyone share with me the Basic tutorials? waiting for yours positive responses...........

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