I would like to set-up a problem for a fluid with a non-Newtonian viscosity dependence.
Are there any built in models for doing this in CFX?
There are various non-Newtonian viscosity models available in CFX as beta features. The available models are the Herschel-Bulkley, Bird-Carreau, Cross, and Power-Law models. The Bingham Plastic model can be set up as a special case of the Herschel-Bulkley model. To enable access to the models, you can modify the RULES file located in the /etc folder of the CFX installation directory as follows. 1. First copy the existing RULES file to another file (say RULES.OLD) so that the original file is preserved. 2. Edit the RULEs file and find the object: SINGLETON: DYNAMIC VISCOSITY Replace the entire SINGLETON: DYNAMIC VISCOSITY object with the corresponding object contained in the attached file short_rules. 3. Save the modified RULES file and start the CFX launcher. If you edit an existing definition file using the Solver Manager, you will be able to change the Option for Dynamic Viscosity for a particular material to one of the non-Newtonian options. You must then add and set the desired parameters for that particular model. Contact your CFX support representative if you have any questions on this procedure. |
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