That means an increase in fluid viscosity with an increase in the shear rate, hence also called ‘thickening’ fluids. The dilatant or shear-thickening behavior is then described as being opposite to shear-thinning. Some common substances that undergo shear-thinning are ketchup, nail polish, silicone oil, and whipped cream. The pseudo-plasticity or shear-thinning behavior is described as a decrease in the viscosity of the fluid with an increase in the shear rate. The 3 main types of non-newtonian fluids are briefly described as follows: Pseudo-Plastic or Shear-Thinning Fluids Just go to Materials, select a material from the library, and choose a Viscosity model that you would want to use from the drop-down.įigure 1: A typical stress-strain plot for non-Newtonian fluids WorkbenchĬurrently, non-Newtonian fluids are only available for incompressible, multiphase, and convective heat transfer (incompressible) analysis types. Some of these fluids become runnier when shaken while some become more viscous. Some examples are fluids like ketchup, custard, toothpaste, starch suspensions, paint, blood, and shampoo. Further, it is also important to note that the viscosity can be dependent on the shear rate or the time history of the shear rate. Therefore, the viscosity is not a fixed scalar but a variable. In a non-Newtonian fluid, the local shear stresses and the local shear rates in the fluid have a non-linear relation, where a proportionality constant can not be defined. On this page, the most commonly used non-Newtonian models available on the SimScale platform are described in detail. Non-Newtonian models are used to model the behavior of non-Newtonian fluids in CFD simulations.
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