gmsh生成非结构网格详解(之一)

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1、Gmsh生成非结构网格详解（之一）在流体计算中，我们经常要生成二维非结构网格。利用Gmsh软件可以快速生成，我们T面可以看一个例子，例子在gmsh的tutorial目录中：下而是t4.geo的完整说明：cm=le-02;el=4.5*cm;e2=6*cm/2;e3=5*cm/2;hl二5*cm;h2=10*cm;h3=5*cm;h4=2*cm;h5=4.5*cm;R1=1*cm;R2=1.5*cm;r=1*cm;ccos=(-h5*Rl+e2*Hypot(h5，Hypot(e2，Rl)))/(h5八2+e2A2);ssin=Sqr

2、t(l-ccos八2);Lcl=0.01;Lc2=0.003;//下面是所冇的操作符的列表，除了以外，这些操作符和C、C++//语言屮都是一样的：////’■’(inbothunaryandbinaryversions，i.e.asin•-「and’1-2’)//’!r(thenegation)//，+•////7，//，o/of(therestoftheintegerdivision)//，＜•//，〉•////〉='//»»//♦//’&&’(and)//IP(or)//'ll1(or)//’八’(power)//(thete

3、rnaryoperator)////使用括号可以将表达式结合////除了这些操作符以外，所有的C数学函数也能够使用（注意首字母//要大写）：////Exp(x)//Log(x)//Log10⑻//Sqrt(x)//Sin(x)//Asin(x)//Cos(x)//Acos(x)//Tan(x)//Atan(x)1"Atan2(x,y)//Sinh(x)//Cosh(x)//Tanh(x)//Fabs(x)1"Floor(x)//Ceil(x)//Fmod(x，y)////我们还有增加的函数：////Hypot(x，y)comput

4、esSqrt(x八2+y八2)//Rand(x)generatesarandomnumberin[0，xl////Gmsh屮唯一预定义的常数就是Pi.Point(l)={-el-e2,0.0，0.0，Lcl};Point(2)={-el-e2,hl，0.0，Lcl};Point(3)={-e3-r，hl，0.0，Lc2};Point⑷={-e3-r，hl+r，0.0，Lc2};Point(5)={-e3，hl+r，0.0，Lc2};Point(6)={-e3,h1+h2,0.0,Lcl};Point(7)={e3，h1+h2,0.

5、0,Lcl};Point(8)={e3,hl+r,0.0,Lc2};Point(9)={e3+r，h1+r，0.0，Lc2};Point(10)={e3+r，h1，0.0，Lc2};Point(l1)={el+e2，hl,0.0,Lcl};Point(12)={el+e2,0.0,0.0,Lcl};Point(13)={e2,0.0，0.0,Lcl};Point(14)={R1/ssin，h5+R1*ccos，0.0，Lc2};

6、Point(15)={0.0，h5,0.0，Lc2};Point(16)={-R1/ssin，h5+R

7、l*ccos，0.0，Lc2};Point(17)={-e2,0.0,0.0,Lcl};Point(18)={-R2Point(19)={-R2Point(20)={0.0Point(21)={R2Point(22)={R2，hl+h3,0.0,Lc2};，hl+h3+h4,0.0,Lc2};，hl+h3+h4,0.0,Lc2};,hl+h3+h4,0.0,Lc2};,hl+h3,0.0,Lc2};Point(23)={0.0,hl+h3,0.0,Lc2};Point(24)={0,hl+h3+h4+R2,0.0，Lc2};Poi

8、nt(25)={0，hl+h3-R2，0.0,Lc2};Line(l)={1,17};Line(2)={17,16};//I员I弧是通过三个给定的点來定义的，分别表示起始点、屮心点和截止点。//所有的圆弧都应该是顺时针的。这三个点不应该在同一条直线上，//否则您应该指定这个圆弧位于那个平面上如////Circle(num)={start,center,end}Plane{nx,ny,nz}Circle(3)={14,15,16};Line(4)={14,13};Line(5)={13,12};Line(6)={12,11};Lin

9、e(7)={11,10};Circle(8)={8,9,10};Line(9)={8,7};Line(10)={7,6};Line(ll)={6,5};Circle(12)={3,4,5};Line(13)={3,2};Line(14)={2,1}