DFLUX子程序环形路径坐标变换
vr=v/r
phi=vr*TIME(2)
x=COORDS(1)
y=COORDS(2)
z=COORDS(3)
IF(z .GE. 0.0) THEN
theta=acos(x/sqrt(x*x+z*z))
ELSE
theta=2.0*PI-acos(x/sqrt(x*x+z*z))
ENDIF
deta=theta-phi
x1=sqrt(x*x+z*z)*cos(deta)
y1=y
z1=sqrt(x*x+z*z)*sin(deta)
我的理解是PHI为热源走过弧长所对应的圆心角，想请教下theta和deta表示哪些角度呢？
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