Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://mooseframework.inl.gov
       3             : //*
       4             : //* All rights reserved, see COPYRIGHT for full restrictions
       5             : //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
       6             : //*
       7             : //* Licensed under LGPL 2.1, please see LICENSE for details
       8             : //* https://www.gnu.org/licenses/lgpl-2.1.html
       9             : 
      10             : #pragma once
      11             : 
      12             : #include "AuxKernel.h"
      13             : 
      14             : // Forward Declarations
      15             : 
      16             : /**
      17             :  * Computes the Q criterion as defined by the paper
      18             :  *
      19             :  * Jeong, Jinhee & Hussain, Fazle. (1995).
      20             :  * Hussain, F.: On the identification of a vortex.
      21             :  * JFM 285, 69-94. Journal of Fluid Mechanics. 285.
      22             :  * 69 - 94. 10.1017/S0022112095000462.
      23             :  *
      24             :  * This scalar quantity aids in the identification of vortices.
      25             :  * It quantifies the local balance between shear strain rate
      26             :  * and vorticity magnitude. It vanishes at the wall. Taking
      27             :  * contours of this quantity in visualization software will
      28             :  * show the vortices in the flow in a rather pronounced manner.
      29             :  */
      30             : class INSQCriterionAux : public AuxKernel
      31             : {
      32             : public:
      33             :   static InputParameters validParams();
      34             : 
      35             :   INSQCriterionAux(const InputParameters & parameters);
      36             : 
      37           0 :   virtual ~INSQCriterionAux() {}
      38             : 
      39             : protected:
      40             :   virtual Real computeValue() override;
      41             : 
      42             :   // Velocity gradients
      43             :   const VectorVariableGradient & _grad_velocity;
      44             : };