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Boundedness of classical solutions for a chemotaxis model with rotational flux terms

机译:具有旋转通量术语的趋化性模型的经典解的界限

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In this paper, we study the following chemotaxis system with rotational flux terms: {u_t = ?· (?u - uS(x,u,v)?v), x∈ Ω, t > 0, v_t = Δv -f(x,u,v), x∈ Ω, t > 0, under no-flux boundary conditions in a bounded domain Ω ? R~n, n ≥ 2, with smooth boundary. Here, S ∈ C~2(Ω? × [0,∞)~2;?~(n×n)) is a matrix-valued function and |S(x,u,v)| ≤ S_0(v), where S_0 is some non-decreasing function. Also, f ∈ C~1(Ω? × [0, ∞)~2;?) is a non-negative function with f(x,u, 0) = 0 and f(x,u,v) ≤ f_0(v)(1 + u), where f_0 is some non-decreasing function. We prove that the classical solutions to the above system are uniformly in-timebounded if there exists a smooth function z(s) with z'(s) ≥ 0 such that for some p >n/2 the matrix-valued function: (p - 1/4) S~t(x,r,s)S(x,r,s) +[1/p(p-1)(z'(s))~2 - 1/pz''(s)] I_n be a negative semi-definite matrix. Here, S~t denotes the transpose of S and I_n is an n × n identity matrix.We show that the preceding matrix-valued function is a negative semi-definite matrix provided that ||v_0||_(L∞(Ω))S_0(||v_0||_(L∞(Ω))) < π√2/n. These results extend the recent results obtained by Li et al. (Math. Models Methods Appl. Sci.) (2015) and Zhang (Math. Nachr.) (2016). We also study the special case S = xI_n with x > 0. The above matrix in this case is written as: [1/4(p - 1)x~2 + 1/p(p - 1)(z'(s))~2 - 1/pz''(s)]I_n:= Z(s)I_n. For this case, we present a smooth function z(s) with z'(s) ≥ 0 such that the matrix-valued function z(s)I_n is a negative semi-definite matrix provided that 0 < ||v_0||_(L∞(Ω)) < π/x√2/n. This result extends the result obtained for this problem which asserts the boundedness of classical solutions under the condition 0 < ||v_0||_(L∞(Ω)) < 1/6x(n+1) . More precisely, by comparing the two conditions, we can write lim_(n→∞)π/x√2/n/1/6x(n+1)= +∞.
机译:在本文中,我们研究了具有旋转助焊剂的趋化性系统:{U_T =?·(?U - US(x,U,V)?v),x∈ω,t> 0,v_t =ΔV-f( x,u,v),x∈ω,t> 0,在界域的无通量边界条件下ωΩ R〜n,n≥2,具有平滑的边界。这里,s∈c〜2(ω×[0,∞)〜2;〜(n×n))是矩阵值函数和| s(x,u,v)| ≤S_0(v),其中S_0是一些非减小功能。此外,F≠C〜1(ω≤x[0,∞)〜2 ;?)是具有f(x,u,0)= 0和f(x,u,v)≤f_0的非负函数( v)(1 + U),其中f_0是一些非减小功能。我们证明,如果具有z'(s)≥0的光滑功能z,则以上述系统的经典解决方案均匀地呈上绑定,使得对于一些p> n / 2来说是矩阵值函数:(p - 1/4)S〜T(x,r,s)s(x,r,s)+ [1 / p(p-1)(z'(s))〜2 - 1 / pz''(s )] i_n是一个负半定矩阵。这里,s〜t表示θ和i_n是n×n identity矩阵.we表明前面的矩阵值函数是一个负半定矩阵,提供了|| v_0 || _(l∞(ω) )S_0(|| v_0 || _(l∞(ω)))<π√2/ n。这些结果延长了Li等人获得的最近结果。 (数学。模型方法应用程序。SCI。)(2015)和张(数学。NACHR。)(2016)。我们还使用x> 0研究特殊情况s = xi_n。在这种情况下,上述矩阵被写为:[1/4(p-1)x〜2 + 1 / p(p-1)(z'(s )))〜2 - 1 / pz''(s)] i_n:= z(s)i_n。对于这种情况,我们呈现一个具有z'(s)≥0的平滑功能z,使得矩阵值函数z(s)i_n是一个负半定矩阵,提供了0 <|| v_0 || _ (L∞(ω))<π/x√2/ n。该结果扩展了该问题所获得的结果,该结果断言条件0 <|| V_0 || _(L∞(ω))<1 / 6x(n + 1)下的经典解的界限。更确切地说,通过比较两个条件,我们可以写入LIM_(n→∞)π/x√2/ n / 1/6x(n + 1)= +∞。

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