The derived class from the hydro base class to solve the incompressible NSE in 2D. More...

#include "lib/hydro.h"

Inheritance diagram for hydro_d2:

Public Member Functions
	hydro_d2 (const grid &mesh, const parser &solParam, parallel &mpiParam)
	Constructor of the hydro_d2 class derived from the base hydro class. More...

void	solvePDE ()
	The core publicly accessible function of the hydro class to solve the Navier-Stokes equations. More...

real	testPeriodic ()
	Function to test whether periodic BC is being implemented properly. More...

Public Member Functions inherited from hydro
	hydro (const grid &mesh, const parser &solParam, parallel &mpiParam)
	Constructor of the base hydro class. More...

Additional Inherited Members
Public Attributes inherited from hydro
vfield	V
	The vector field that stores the velocity field.

sfield	P
	The scalar field that stores the pressure field.

force *	vForcing
	Instance of force class to handle velocity field forcing.

Protected Member Functions inherited from hydro
void	checkPeriodic ()
	Function to enable/disable periodic data transfer as per the problem. More...

void	setCoefficients ()
	Function to set the coefficients used for solving the implicit equations of U, V and W. More...

void	initVBC ()
	Function to initialize the boundary conditions for velocity. More...

void	imposeUBCs ()
	Function to impose the boundary conditions for the X-component of velocity. More...

void	imposeVBCs ()
	Function to impose the boundary conditions for the Y-component of velocity. More...

void	imposeWBCs ()
	Function to impose the boundary conditions for the Z-component of velocity. More...

void	initVForcing ()
	Function to initialize the forcing terms for velocity. More...

virtual void	solveVy ()
	Function to solve the implicit equation for y-velocity. More...

Protected Attributes inherited from hydro
int	timeStepCount
	Integer value for the number of time-steps elapsed - it is incremented by 1 in each time-step.

int	maxIterations
	Maximum number of iterations for the iterative solvers hydro::solveVx, hydro::solveVy and hydro::solveVz.

real	time

real	dt

real	hx

real	hy

real	hz

real	hx2

real	hz2

real	hz2hx2

real	hx2hy2

real	hy2hz2

real	hx2hy2hz2

const grid &	mesh

const parser &	inputParams

const real	inverseRe

probes *	dataProbe
	Instance of the probe class to collect data from probes in the domain.

boundary *	uLft
	Instances of the boundary class to impose boundary conditions on all the 6 walls for the 3 components of the velocity field.

boundary *	uRgt

boundary *	uFrn

boundary *	uBak

boundary *	uTop

boundary *	uBot

boundary *	vLft

boundary *	vRgt

boundary *	vFrn

boundary *	vBak

boundary *	vTop

boundary *	vBot

boundary *	wLft

boundary *	wRgt

boundary *	wFrn

boundary *	wBak

boundary *	wTop

boundary *	wBot

parallel &	mpiData
	Instance of the parallel class that holds the MPI-related data like rank, xRank, etc.

plainsf	Pp
	Plain scalar field into which the pressure correction is calculated and written by the Poisson solver.

plainsf	mgRHS
	Plain scalar field into which the RHS for pressure Poisson equation is written and passed to the Poisson solver.

plainvf	nseRHS
	Plain vector field into which the RHS of the Navier-Stokes equation is written and stored.

plainvf	velocityLaplacian
	Plain vector field into which the RHS of the implicit equation for velocities are calculated during iterative solving.

plainvf	pressureGradient
	Plain vector field which stores the pressure gradient term.

plainvf	guessedVelocity
	Plain vector field which serves as a temporary array during iterative solution procedure for velocity terms.

Detailed Description

The derived class from the hydro base class to solve the incompressible NSE in 2D.

Certain paramters to be used in the implicit calculation of velocity are defined separately from within the class. Since the class is instantiated when solving the NSE in 2D, the y-direction component of the grid is supressed. Consequently, the boundary conditions are imposed only on 4 sides of the domain.

Constructor & Destructor Documentation

◆ hydro_d2()

hydro_d2::hydro_d2	(	const grid &	mesh,
		const parser &	solParam,
		parallel &	mpiParam
	)

Constructor of the hydro_d2 class derived from the base hydro class.

     The constructor passes its arguments to the base hydro class and then initializes all the scalar and
     vector fields necessary for solving the NS equations.
     The various coefficients for solving the equations are also set by a call to the \ref setCoefficients function.
     Based on the problem type specified by the user in the parameters file, and stored by the \ref parser class as
     \ref parser#probType "probType", the appropriate boundary conditions are specified.

Parameters

mesh	is a const reference to the global data contained in the grid class
solParam	is a const reference to the user-set parameters contained in the parser class

Member Function Documentation

◆ solvePDE()

void hydro_d2::solvePDE ( )

virtual

The core publicly accessible function of the hydro class to solve the Navier-Stokes equations.

     The NSE are integrated in time from within this function by calling \ref hydro#timeAdvance in a loop.
     The function keeps track of the non-dimensional time with \ref time and number of iterations with \ref iterCount.
     Both these values are continuously incremented from within the loop, and finally, when \ref time has reached the
     user-ser value in \ref parser#tMax "tMax", the time-integration loop is broken and the program exits.

Reimplemented from hydro.

◆ testPeriodic()

real hydro_d2::testPeriodic ( )

virtual

Function to test whether periodic BC is being implemented properly.

     The function populates the arrays with predetermined values at all locations.
     It then calls imposeUBCs, imposeVBCs and imposeWBCs functions and checks if the correct values of the functions are imposed at boundaries