%--------------------------
 % @Author: Jingqiao Hu
 % @Date: 2021-12-11 21:14:42
 % @LastEditTime: 2022-01-29 20:21:40
%--------------------------
function [v_local, v] = volume_cvt(rho_cell, area_cell, area0)
    
    ncvt = size(rho_cell, 1);
    v_local = zeros(ncvt, 1);
    v_global = 0;
    parfor ele = 1:ncvt
        area = area_cell{ele};
        v = area .* rho_cell{ele};
        v_local(ele) = sum(v) / sum(area); 
        
        v_global = v_global + sum(v);
    end

    v = v_global / area0;
end