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    Domain *d=Get_Domain(1);
    Material *mix = mixture_material(d);
    k_m = MATERIAL_PROP(mix, PROP_ktc);
    rho_m = MATERIAL_PROP(mix, PROP_rho);
    vis_m = MATERIAL_PROP(mix, PROP_mu);
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    ux = C_U(c,t);
    uy = C_V(c,t);
    uz = C_W(c,t);
    us = pow(pow(ux,2)+pow(uy,2)+pow(uz,2),,0.5);
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