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for i=1:I
    for j=1:J
        for n=0:N-1
            f(i,j,n)=feq(u,n,rho);
        end
    end
end

function result=feq(u,n,rho)   
   %u(i,j,1)ÊÇ×ø±êλÖÃΪ£¨i,j£©´¦µÄˮƽËÙ¶È£¬u(i,j,2)ÊÇÊúÖ±·½ÏòµÄËÙ¶È
w=[4/9,1/9,1/9,1/9,1/9,1/36,1/36,1/36,1/36];
e=[0,0;1,0;0,1;-1,0;0,-1;1,1;-1,1;-1,-1;1,-1];
for i=1:I-1
    for j=1:J-1
        for n=1:N
          eu=e(n,1).*u(:,:,1)+e(n,2).*u(:,:,2);
          uv=u(:,:,1).*u(:,:,1)+u(:,:,2).*u(:,:,2);
   %uvÊÇˮƽ·½ÏòÓëÊúÖ±·½ÏòËÙ¶ÈµÄÆ½·½ºÍ
          result=w(n)*rho*(1+3*eu+4.5*eu.*eu-1.5*uv);
        end
    end
end
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°ÙÀïµÀ: »ØÌûÖö¥ 2012-10-28 08:52:42
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15Â¥: Originally posted by csgt0 at 2012-10-26 15:33:25
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function feq=result(p,rho1)
N=9;
w=;
e=;
for n=1:N
    eu=e(n,1)*p(1)+e(n,2)*p(2);
    uv=p(1)^2+p(2)^2;
    feq( ...

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for i=2:I
    for j=2:J
        for n=1:N
          ip=i-e(n,1);
          jp=j-e(n,2);
          p=[u(ip,jp,1),u(ip,jp,2)];
          rho1=rho(ip,jp);
          F(i,j,=f(ip,jp,+(result(p,rho1)-f(ip,jp,)/tau;
        end
    end
end
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??? Error using ==> minus
Matrix dimensions must agree.

Error in ==> LBGK_D2Q9_liddrivenflow at 44
          F(i,j,=f(ip,jp,+(result(p,rho1)-f(ip,jp,)/tau;

Ìáʾ¾ØÕóάÊý²»Ò»Ö£¬ÊDz»ÊÇ˵f(i,j,n)ÊÇÈýάµÄ£¬¶øµ÷ÓõÄfeq(n)ÊÇһάµÄ£¬ÕâÑùµÄ»°Ôõô°Ñfeq±äΪÈýάÊý×飿
²»ÖªµÀÎÒµÄÀí½â¶Ô²»¶Ô£¿ÔõôÑù²ÅÄܰÑfeq±ä³ÉÈýάÊý×飿

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for i=2:I
    for j=2:J
        for n=1:N
          ip=i-e(n,1);
          jp=j-e(n,2);
          p=[u(ip,jp,1),u(ip,jp,2)];
          rho1=rho(ip,jp);
          F(i,j,n)=f(ip,jp,n)+(result(p,rho1)-f(ip,jp,n))/tau;
        end
    end
end
Ìáʾ³öÏÖ´íÎó
??? Assignment has more non-singleton rhs dimensions than non-singleton
subscripts

Error in ==> LBGK_D2Q9_liddrivenflow at 44
          F(i,j,n)=f(ip,jp,n)+(result(p,rho1)-f(ip,jp,n))/tau;

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==
16Â¥2012-10-27 09:53:25
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BlueAsia

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2Â¥2012-10-22 19:02:35
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ľ³æ (³õÈëÎÄ̳)

ÒýÓûØÌû:
2Â¥: Originally posted by BlueAsia at 2012-10-22 19:02:35
Ö±½ÓÊäÈëµ½matlabÀïÈüÆËã»ú°ïÄãÕÒ´íÎ󣬶Եϰ¾ÍÄܵõ½ÕýÈ·½á¹ûÁËѽ

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3Â¥2012-10-23 08:28:36
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BlueAsia

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jjdg: ½ð±Ò+1, ¸Ðл²ÎÓë 2012-10-24 10:13:51
ÒýÓûØÌû:
3Â¥: Originally posted by °ÙÀïµÀ at 2012-10-23 08:28:36
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4Â¥2012-10-23 09:16:44
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%Initialization
F=zeros(I,J,N); f=zeros(I,J,N);u=zeros(I,J,2);rho=zeros(I,J);
for i=1:I+1
    for j=1:J+1
        u(i,j,1)=0;u(i,j,2)=0;
        rho(i,j)=rho0;
        u(i,J+1)=U;
        for n=1:N
            feq(i,j,n)=result(u,n,rho(i,j));
            f(i,j,n)=feq(i,j,n);
        end
    end
end
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function feq=result(u,n,rho)
% double eu,uv,feq;
w=[4/9,1/9,1/9,1/9,1/9,1/36,1/36,1/36,1/36];
e=[0,0;1,0;0,1;-1,0;0,-1;1,1;-1,1;-1,-1;1,-1];
I=256;J=256;
N=length(w);
for i=1:I-1
    for j=1:J-1
        for n=1:N
          eu=e(n,1).*u(i,j,1)+e(n,2).*u(i,j,2);
          uv=u(i,j,1).*u(i,j,1)+u(i,j,2).*u(i,j,2);
          feq=w(n)*rho*(1+3*eu+4.5*eu.*eu-1.5*uv);
        end
    end
end
»¹ÊÇbusy
ctrl+cºó³öÏÖ
??? Operation terminated by user during ==> LBGK_D2Q9_liddrivenflow>result at 94

In ==> LBGK_D2Q9_liddrivenflow at 25
            feq(i,j,n)=result(u,n,rho(i,j));


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5Â¥2012-10-24 09:38:37
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csgt0

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showmethemoney
6Â¥2012-10-24 13:33:14
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feq(i,j,n)=result(u,n,rho(i,j));
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7Â¥2012-10-24 16:23:36
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csgt0

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showmethemoney
8Â¥2012-10-24 17:27:13
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ÒýÓûØÌû:
8Â¥: Originally posted by csgt0 at 2012-10-24 17:27:13
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eu=1*u1+0*u2;uv=u1^2+u2^2;feq=1/9*rho*(1+3*eu+4.5*eu.*eu-1.5*uv);
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9Â¥2012-10-25 09:28:35
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csgt0

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°´ÄãµÄÒâ˼ÎÒÀí½âÊǶÔÓ¦Ò»¸ö(i,j)£¬ÓÐÁ½¸öËÙ¶Èu(i,j,1),u(i,j,2)£¬¶ÔÓ¦8¸ö·½Ïò£¬·Ö±ðÊÇwµÄ8ÐУ¬Òò´ËÒ»¸öµãÓ¦¸Ã¼ÆËãµÃµ½8¸öfeq
ËùÒÔ×Óº¯Êýд³Éfunction result=feq(u,rho)
ÆäÖÐÒ»¾ä¸Ä³Éfeq(i,j,n)=w(n)*rho*(1+3*eu+4.5*eu.*eu-1.5*uv);
ÕâÑùÄãÔÚÖ÷º¯ÊýÀï¾Í²»ÓÃÔÙÑ­»·ÁË¡£´ËÍ⣬ÆäʵÓþØÕó¼ÆËã¿ÉÒÔÉÙÓÃÑ­»·µÄ£¬»á¿ìЩ¡£
showmethemoney
10Â¥2012-10-25 09:42:05
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