<p>We prove Liouville-type theorems for the stationary incompressible Navier-Stokes and MHD equations in <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathbb {R}^{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mn>3</mn> </msup> </math></EquationSource> </InlineEquation> under certain growth conditions at far annulus field. Precisely, let the potential tensor function <i>V</i> satisfy that <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\nabla \cdot {V}=u\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">∇</mi> <mo>·</mo> <mi>V</mi> <mo>=</mo> <mi>u</mi> </mrow> </math></EquationSource> </InlineEquation> for a smooth solution <i>u</i> of the stationary Navier-Stokes equations, we show that if the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(L^{s}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>L</mi> <mi>s</mi> </msup> </math></EquationSource> </InlineEquation> mean oscillation of the potential <i>V</i> on the annulus at infinity satisfies suitable growth condition, then <i>u</i> must be zero. Furthermore, the triviality of <i>u</i> and <i>b</i> for the MHD equations can also be guaranteed under additional growth condition of certain Lorentz norms for the magnetic field.</p>

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Liouville-type theorems for the stationary Navier-Stokes and MHD equations with potential growth condition at far annulus field

  • Peng Wang,
  • Zhengguang Guo

摘要

We prove Liouville-type theorems for the stationary incompressible Navier-Stokes and MHD equations in \(\mathbb {R}^{3}\) R 3 under certain growth conditions at far annulus field. Precisely, let the potential tensor function V satisfy that \(\nabla \cdot {V}=u\) · V = u for a smooth solution u of the stationary Navier-Stokes equations, we show that if the \(L^{s}\) L s mean oscillation of the potential V on the annulus at infinity satisfies suitable growth condition, then u must be zero. Furthermore, the triviality of u and b for the MHD equations can also be guaranteed under additional growth condition of certain Lorentz norms for the magnetic field.