给我找一个基于LBM模拟多孔介质流体流动的matlab程序？

以下是一个基于LBM模拟多孔介质流体流动的 Matlab 程序示例：

% 定义常量
rho0 = 1;
nu0 = 0.1;
dx = 1;
dt = 1;
Lx = 100;
Ly = 100;
N = Lx/dx;
omega = 1.8;

% 初始化速度和密度
u = zeros(N,N);
v = zeros(N,N);
rho = ones(N,N);

% 定义碰撞过程
feq = @(rho,u,v) (4/9)*rho.*(1 - 1.5*(u.^2 + v.^2) + 3*(u.^2 + v.^2).*[1 1 0 1 0 0 -1 -1 -1]');

% 定义边界条件
boundary = @(f) (f - feq(rho,u,v) + feq(rho0,zeros(N,N),zeros(N,N)));

% 迭代计算
for t = 1:1000
    % 计算宏观参数
    rho = sum(f,3);
    u = sum(f.*[1 1 0 -1 -1 -1 0 1 0]',3)./rho;
    v = sum(f.*[0 1 1 1 0 -1 -1 -1 0]',3)./rho;
    
    % 处理边界条件
    f(:,1,:) = boundary(f(:,1,:));
    f(:,N,:) = boundary(f(:,N,:));
    f(1,:,:) = boundary(f(1,:,:));
    f(N,:,:) = boundary(f(N,:,:));
    f(1,1,:) = boundary(f(1,1,:));
    f(1,N,:) = boundary(f(1,N,:));
    f(N,1,:) = boundary(f(N,1,:));
    f(N,N,:) = boundary(f(N,N,:));
    
    % 碰撞过程
    f = (1-omega).*f + omega.*feq(rho,u,v);
    
    % 对流过程
    for i = 2:N-1
        for j = 2:N-1
            rho(i,j) = sum(f(i,j,:));
            u(i,j) = sum(f(i,j,:).*[1 1 0 -1 -1 -1 0 1 0]')/rho(i,j);
            v(i,j) = sum(f(i,j,:).*[0 1 1 1 0 -1 -1 -1 0]')/rho(i,j);
        end
    end
    
    % 更新速度场和密度场
    u(1,:) = 0;
    u(N,:) = 0;
    v(:,1) = 0;
    v(:,N) = 0;
    rho(1,:) = rho0;
    rho(N,:) = rho0;
    rho(:,1) = rho0;
    rho(:,N) = rho0;
    
    % 绘制流场图
    quiver(u,v);
    axis([0 Lx 0 Ly]);
    drawnow;
end

注意，这只是一个示例程序，具体实现方式可能因模拟对象和要求的精度而有所不同。您需要根据您的具体需求进行调整。