Revision as of 14:34, 24 June 2022 view source Melissa.Moghanloo (talk \| contribs) Bureaucrats, Administrators 2,918 edits →Can TUFLOW model non-water liquids? ← Older edit		Revision as of 14:47, 24 June 2022 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,395 edits →Can TUFLOW model non-water liquids? Newer edit →
Line 62: ==Can TUFLOW model non-water liquids?== Yes, this can be used by setting the following commands: :<font color="blue"><tt>Viscosity Formulation </tt></font><font color="red"><tt>== </tt></font>Non-Newtonian<br> ▼ :<font color="blue"><tt>Viscosity Coefficients </tt></font><font color="red"><tt>== </tt></font>k, n, muLow, muHigh, tau0▼ Where Kk is the viscosity coefficient in Pa S.s when n = 1. Where n=1, this relates to a Newtonian fluid. You can then use an appropriate value for tau0, the stress required to make the fluid move. The Non-Newtonian model uses the Herschel-Bulkley approach which can be used to model Newtonian fluids with different viscosities. See section 5.4 of the ~~new release notes [~~<u>[https://downloads.tuflow.com/TUFLOW/Releases/2020-10/TUFLOW%20Release%20Notes.2020-10-AD.pdf ~~here]~~2020 Release Notes]</u> for more information.▼ <br>The <font color="blue"><tt>viscosity coefficients </tt></font><font color="red"><tt>== </tt></font>command on its own is used to set the eddy viscosity. In this instance, you need to set the dynamic viscosity, which is a property of the fluid itself. This can be used by setting the following commands: The graphs below explains the Herschel-Bulkley approach and it’s flexibility. : ▼ ▲<font color="blue"><tt>Viscosity Formulation </tt></font><font color="red"><tt>== </tt></font>Non-Newtonian<br> ▲<font color="blue"><tt>Viscosity Coefficients </tt></font><font color="red"><tt>== </tt></font>k, n, muLow, muHigh, tau0 ▲Where K is the viscosity coefficient in Pa S when n = 1. Where n=1, this relates to a Newtonian fluid. You can then use an appropriate value for tau0, the stress required to make the fluid move. The Non-Newtonian model uses the Herschel-Bulkley approach which can be used to model Newtonian fluids with different viscosities. See section 5.4 of the new release notes [[https://downloads.tuflow.com/TUFLOW/Releases/2020-10/TUFLOW%20Release%20Notes.2020-10-AD.pdf here]] for more information. ▲The graphs below explains the Herschel-Bulkley approach and it’s flexibility. :[[File:Newtonian_Model.png \| 400px]] Line 94 ⟶ 91: You can test this out using the following commands. :<font color="blue"><tt>Viscosity Formulation </tt></font><font color="red"><tt>== </tt></font>Non-Newtonian<br> :<font color="blue"><tt>Viscosity Coefficients </tt></font><font color="red"><tt>== </tt></font>0.001, 1, 0.0, 1000, 0 This uses a n value of 1, a Ƭ0=0 and a viscosity coefficient of 0.001 Pa S which is a typical viscosity of water at 20 ℃. This should give comparable outputs to a standard TUFLOW model without the Non-Newtonian functionality.

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