<p>The chemotaxis-Stokes system with flux limitation and nonlinear production <Equation ID="Equ54"> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{array}{ll} n_t=\Delta n- \nabla \cdot (n F(|\nabla c|^2)\nabla c)-u\cdot \nabla n,&amp; (x,t)\in \Omega \times (0,T),\\ c_t=\Delta c-c+g (n)-u\cdot \nabla c,&amp; (x,t)\in \Omega \times (0,T),\\ u_t=\Delta u+\nabla P+n\nabla \phi , \ \ \nabla \cdot u=0 ,&amp; (x,t)\in \Omega \times (0,T) \end{array}\right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd columnalign="left"> <mrow> <msub> <mi>n</mi> <mi>t</mi> </msub> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>n</mi> <mo>-</mo> <mi mathvariant="normal">∇</mi> <mo>·</mo> <msup> <mrow> <mo stretchy="false">(</mo> <mi>n</mi> <mi>F</mi> <mo stretchy="false">(</mo> <mo stretchy="false">|</mo> <mi mathvariant="normal">∇</mi> <mi>c</mi> <mo stretchy="false">|</mo> </mrow> <mn>2</mn> </msup> <mrow> <mo stretchy="false">)</mo> <mi mathvariant="normal">∇</mi> <mi>c</mi> <mo stretchy="false">)</mo> </mrow> <mo>-</mo> <mi>u</mi> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mi>n</mi> <mo>,</mo> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo>,</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>∈</mo> <mi mathvariant="normal">Ω</mi> <mo>×</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <mi>T</mi> <mo stretchy="false">)</mo> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <msub> <mi>c</mi> <mi>t</mi> </msub> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>c</mi> <mo>-</mo> <mi>c</mi> <mo>+</mo> <mi>g</mi> <mrow> <mo stretchy="false">(</mo> <mi>n</mi> <mo stretchy="false">)</mo> </mrow> <mo>-</mo> <mi>u</mi> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mi>c</mi> <mo>,</mo> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo>,</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>∈</mo> <mi mathvariant="normal">Ω</mi> <mo>×</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <mi>T</mi> <mo stretchy="false">)</mo> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <msub> <mi>u</mi> <mi>t</mi> </msub> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>u</mi> <mo>+</mo> <mi mathvariant="normal">∇</mi> <mi>P</mi> <mo>+</mo> <mi>n</mi> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <mo>,</mo> <mspace width="4pt" /> <mspace width="4pt" /> <mi mathvariant="normal">∇</mi> <mo>·</mo> <mi>u</mi> <mo>=</mo> <mn>0</mn> <mo>,</mo> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo>,</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>∈</mo> <mi mathvariant="normal">Ω</mi> <mo>×</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <mi>T</mi> <mo stretchy="false">)</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>is considered in a smoothly bounded domain <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Omega \subset \mathbb {R}^2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Ω</mi> <mo>⊂</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> associated with Neumann conditions for <i>n</i>,&#xa0;<i>c</i> and Dirichlet boundary condition for <i>u</i>, where <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\phi \in W^{2,\infty }(\Omega )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ϕ</mi> <mo>∈</mo> <msup> <mi>W</mi> <mrow> <mn>2</mn> <mo>,</mo> <mi>∞</mi> </mrow> </msup> <mrow> <mo stretchy="false">(</mo> <mi mathvariant="normal">Ω</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(F(s)\in C^2([0,\infty ))\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>F</mi> <mrow> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> </mrow> <mo>∈</mo> <msup> <mi>C</mi> <mn>2</mn> </msup> <mrow> <mo stretchy="false">(</mo> <mrow> <mo stretchy="false">[</mo> <mn>0</mn> <mo>,</mo> <mi>∞</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(g(s)\in C^1([0,\infty ))\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>g</mi> <mrow> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> </mrow> <mo>∈</mo> <msup> <mi>C</mi> <mn>1</mn> </msup> <mrow> <mo stretchy="false">(</mo> <mrow> <mo stretchy="false">[</mo> <mn>0</mn> <mo>,</mo> <mi>∞</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> satisfy <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(|F(s)|\le K_F (1+s)^{-\frac{\alpha }{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mo stretchy="false">|</mo> <mi>F</mi> <mrow> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">|</mo> </mrow> <mo>≤</mo> <msub> <mi>K</mi> <mi>F</mi> </msub> <msup> <mrow> <mo stretchy="false">(</mo> <mn>1</mn> <mo>+</mo> <mi>s</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mo>-</mo> <mfrac> <mi>α</mi> <mn>2</mn> </mfrac> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(0\le g(s)\le K_g s^{\beta }+K_g\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>0</mn> <mo>≤</mo> <mi>g</mi> <mrow> <mo stretchy="false">(</mo> <mi>s</mi> <mo stretchy="false">)</mo> </mrow> <mo>≤</mo> <msub> <mi>K</mi> <mi>g</mi> </msub> <msup> <mi>s</mi> <mi>β</mi> </msup> <mo>+</mo> <msub> <mi>K</mi> <mi>g</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> for all <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(s\ge 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>s</mi> <mo>≥</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation> with <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(K_F, K_g, \beta &gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>K</mi> <mi>F</mi> </msub> <mo>,</mo> <msub> <mi>K</mi> <mi>g</mi> </msub> <mo>,</mo> <mi>β</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\alpha \in \mathbb {R}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>α</mi> <mo>∈</mo> <mi mathvariant="double-struck">R</mi> </mrow> </math></EquationSource> </InlineEquation>. We show that the system admits a global bounded classical solution if <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(\alpha &gt;1-\frac{1}{(2\beta -1)_+}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>α</mi> <mo>&gt;</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mn>1</mn> <msub> <mrow> <mo stretchy="false">(</mo> <mn>2</mn> <mi>β</mi> <mo>-</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mrow> <mo>+</mo> </msub> </mfrac> </mrow> </math></EquationSource> </InlineEquation>. Furthermore, in the critical case that <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(\alpha =1-\frac{1}{(2\beta -1)_+}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>α</mi> <mo>=</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mn>1</mn> <msub> <mrow> <mo stretchy="false">(</mo> <mn>2</mn> <mi>β</mi> <mo>-</mo> <mn>1</mn> <mo stretchy="false">)</mo> </mrow> <mo>+</mo> </msub> </mfrac> </mrow> </math></EquationSource> </InlineEquation> with <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(\beta &gt;\frac{1}{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>β</mi> <mo>&gt;</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </math></EquationSource> </InlineEquation>, we obtain global bounded solutions if the total mass of cells is small.</p>

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Interplay of flux limitation and nonlinear production in a two-dimensional Keller-Segel-Stokes system

  • Xinru Cao,
  • Liyun Qin

摘要

The chemotaxis-Stokes system with flux limitation and nonlinear production \(\begin{aligned} \left\{ \begin{array}{ll} n_t=\Delta n- \nabla \cdot (n F(|\nabla c|^2)\nabla c)-u\cdot \nabla n,& (x,t)\in \Omega \times (0,T),\\ c_t=\Delta c-c+g (n)-u\cdot \nabla c,& (x,t)\in \Omega \times (0,T),\\ u_t=\Delta u+\nabla P+n\nabla \phi , \ \ \nabla \cdot u=0 ,& (x,t)\in \Omega \times (0,T) \end{array}\right. \end{aligned}\) n t = Δ n - · ( n F ( | c | 2 ) c ) - u · n , ( x , t ) Ω × ( 0 , T ) , c t = Δ c - c + g ( n ) - u · c , ( x , t ) Ω × ( 0 , T ) , u t = Δ u + P + n ϕ , · u = 0 , ( x , t ) Ω × ( 0 , T ) is considered in a smoothly bounded domain \(\Omega \subset \mathbb {R}^2\) Ω R 2 associated with Neumann conditions for nc and Dirichlet boundary condition for u, where \(\phi \in W^{2,\infty }(\Omega )\) ϕ W 2 , ( Ω ) , \(F(s)\in C^2([0,\infty ))\) F ( s ) C 2 ( [ 0 , ) ) and \(g(s)\in C^1([0,\infty ))\) g ( s ) C 1 ( [ 0 , ) ) satisfy \(|F(s)|\le K_F (1+s)^{-\frac{\alpha }{2}}\) | F ( s ) | K F ( 1 + s ) - α 2 and \(0\le g(s)\le K_g s^{\beta }+K_g\) 0 g ( s ) K g s β + K g for all \(s\ge 0\) s 0 with \(K_F, K_g, \beta >0\) K F , K g , β > 0 and \(\alpha \in \mathbb {R}\) α R . We show that the system admits a global bounded classical solution if \(\alpha >1-\frac{1}{(2\beta -1)_+}\) α > 1 - 1 ( 2 β - 1 ) + . Furthermore, in the critical case that \(\alpha =1-\frac{1}{(2\beta -1)_+}\) α = 1 - 1 ( 2 β - 1 ) + with \(\beta >\frac{1}{2}\) β > 1 2 , we obtain global bounded solutions if the total mass of cells is small.