<p>In this paper, we analyze the incompressible 3D chemotaxis system with gradient-dependent flux limitation and logistic source as follows: <Equation ID="Equ120"> <EquationSource Format="TEX">\(\begin{aligned}\,\, \left\{ \begin{aligned}&amp;\partial _{t}\rho +u\cdot \nabla \rho =\Delta \rho -\nabla \cdot (\rho f(|\nabla c|^{2})\nabla c)+\gamma \rho -\mu \rho ^{3},\\&amp;\partial _{t}c+u\cdot \nabla c=\Delta c -c\rho ,\\&amp;\partial _{t}u+(u\cdot \nabla )u+\nabla P=\Delta u-\rho \nabla \phi ,\\&amp;\nabla \cdot u=0. \end{aligned} \right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd /> <mtd columnalign="left"> <mrow> <msub> <mi>∂</mi> <mi>t</mi> </msub> <mi>ρ</mi> <mo>+</mo> <mi>u</mi> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mi>ρ</mi> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>ρ</mi> <mo>-</mo> <mi mathvariant="normal">∇</mi> <mo>·</mo> <msup> <mrow> <mo stretchy="false">(</mo> <mi>ρ</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>γ</mi> <mi>ρ</mi> <mo>-</mo> <mi>μ</mi> <msup> <mi>ρ</mi> <mn>3</mn> </msup> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="right"> <mrow /> </mtd> <mtd columnalign="left"> <mrow> <msub> <mi>∂</mi> <mi>t</mi> </msub> <mi>c</mi> <mo>+</mo> <mi>u</mi> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mi>c</mi> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>c</mi> <mo>-</mo> <mi>c</mi> <mi>ρ</mi> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="right"> <mrow /> </mtd> <mtd columnalign="left"> <mrow> <msub> <mi>∂</mi> <mi>t</mi> </msub> <mi>u</mi> <mo>+</mo> <mrow> <mo stretchy="false">(</mo> <mi>u</mi> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mo stretchy="false">)</mo> </mrow> <mi>u</mi> <mo>+</mo> <mi mathvariant="normal">∇</mi> <mi>P</mi> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>u</mi> <mo>-</mo> <mi>ρ</mi> <mi mathvariant="normal">∇</mi> <mi>ϕ</mi> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="right"> <mrow /> </mtd> <mtd columnalign="left"> <mrow> <mi mathvariant="normal">∇</mi> <mo>·</mo> <mi>u</mi> <mo>=</mo> <mn>0</mn> <mo>.</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>Taking advantage of the structure of the axisymmetric without swirl, we obtain the unique global solution of the system with flux limitation <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(f(\zeta )= K_{f}(1+\zeta )^{-\frac{k}{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>ζ</mi> <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>ζ</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mo>-</mo> <mfrac> <mi>k</mi> <mn>2</mn> </mfrac> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation> for <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(k&gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Global existence of axisymmetric solutions to the 3D chemotaxis system with gradient-dependent flux limitation and logistic source

  • Zhongjiang Zhou,
  • Jinxia Hou,
  • Qian Zhang

摘要

In this paper, we analyze the incompressible 3D chemotaxis system with gradient-dependent flux limitation and logistic source as follows: \(\begin{aligned}\,\, \left\{ \begin{aligned}&\partial _{t}\rho +u\cdot \nabla \rho =\Delta \rho -\nabla \cdot (\rho f(|\nabla c|^{2})\nabla c)+\gamma \rho -\mu \rho ^{3},\\&\partial _{t}c+u\cdot \nabla c=\Delta c -c\rho ,\\&\partial _{t}u+(u\cdot \nabla )u+\nabla P=\Delta u-\rho \nabla \phi ,\\&\nabla \cdot u=0. \end{aligned} \right. \end{aligned}\) t ρ + u · ρ = Δ ρ - · ( ρ f ( | c | 2 ) c ) + γ ρ - μ ρ 3 , t c + u · c = Δ c - c ρ , t u + ( u · ) u + P = Δ u - ρ ϕ , · u = 0 . Taking advantage of the structure of the axisymmetric without swirl, we obtain the unique global solution of the system with flux limitation \(f(\zeta )= K_{f}(1+\zeta )^{-\frac{k}{2}}\) f ( ζ ) = K f ( 1 + ζ ) - k 2 for \(k>0\) k > 0 .