mod_ppm Module

The one-dimensional implementation of the PPM (piecewise parabolic method)

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Variables

Type	Visibility	Attributes		Name		Initial
integer,	public,	parameter	::	fp	=	8

Subroutines

public subroutine cal_cfl_time_step(dx, u, dt, dt_, nt)

计算满足 CFL(Courant–Friedrichs–Lewy) 条件的时间积分步长

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=fp),	intent(in)			::	dx(:)	网格分辨率: m
real(kind=fp),	intent(in)			::	u(:)	风速: m/s
real(kind=fp),	intent(in)			::	dt	全局迭代步长: s
real(kind=fp),	intent(out)			::	dt_	局部迭代步长: s
integer,	intent(out)			::	nt	迭代多少次

public subroutine adv1d_by_ppm(dt, u, c, advc, dx, ds, volume)

基于PPM方法实现的一维平流函数

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=fp),	intent(in)			::	dt	时间间隔: s
real(kind=fp),	intent(in)			::	u(:)	网格右边界风速: m/s
real(kind=fp),	intent(inout)			::	c(:)	网格浓度: ug/m3
real(kind=fp),	intent(out)			::	advc(:)	浓度变化: ug/m3
real(kind=fp),	intent(in),	optional		::	dx	网格分辨率: m
real(kind=fp),	intent(in),	optional		::	ds(:)	网格分辨率: m
real(kind=fp),	intent(in),	optional		::	volume(:)	体积校正因子，dxdydz;