<p>The purpose of this paper is to study the homogenization of the following problem <Equation ID="Equ37"> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{array}{lll} -\sum \limits _{i=0}^{N}\partial _i (a(\frac{x}{\epsilon })|\partial _{i}u_\epsilon |^{p_i-2}\partial _{i}u_\epsilon )=f_\epsilon &amp; \text { in }\Omega , \\ u_\epsilon =0&amp; \text { on }\partial {\Omega }, \end{array} \right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd columnalign="left"> <mrow> <mo>-</mo> <munderover> <mo movablelimits="false">∑</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>N</mi> </munderover> <msub> <mi>∂</mi> <mi>i</mi> </msub> <mrow> <mo stretchy="false">(</mo> <mi>a</mi> </mrow> <mrow> <mo stretchy="false">(</mo> <mfrac> <mi>x</mi> <mi>ϵ</mi> </mfrac> <mo stretchy="false">)</mo> </mrow> <mrow> <mo stretchy="false">|</mo> </mrow> <msub> <mi>∂</mi> <mi>i</mi> </msub> <msub> <mi>u</mi> <mi>ϵ</mi> </msub> <mrow> <msup> <mo stretchy="false">|</mo> <mrow> <msub> <mi>p</mi> <mi>i</mi> </msub> <mo>-</mo> <mn>2</mn> </mrow> </msup> <msub> <mi>∂</mi> <mi>i</mi> </msub> <msub> <mi>u</mi> <mi>ϵ</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <msub> <mi>f</mi> <mi>ϵ</mi> </msub> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mspace width="0.333333em" /> <mtext>in</mtext> <mspace width="0.333333em" /> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <msub> <mi>u</mi> <mi>ϵ</mi> </msub> <mo>=</mo> <mn>0</mn> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mspace width="0.333333em" /> <mtext>on</mtext> <mspace width="0.333333em" /> <mi>∂</mi> <mi mathvariant="normal">Ω</mi> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Omega \)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Ω</mi> </math></EquationSource> </InlineEquation> is a bounded open subset of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\mathbb {R}^{N}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>N</mi> </msup> </math></EquationSource> </InlineEquation> with smooth boundary <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\partial {\Omega }\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>∂</mi> <mi mathvariant="normal">Ω</mi> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(p_i &gt; 1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>p</mi> <mi>i</mi> </msub> <mo>&gt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> for all <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(i = 1 \dots N\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>⋯</mo> <mi>N</mi> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\epsilon \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ϵ</mi> </math></EquationSource> </InlineEquation> is a small real parameter, and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(a(\cdot )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>a</mi> <mo stretchy="false">(</mo> <mo>·</mo> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is a <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(Y\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>Y</mi> </math></EquationSource> </InlineEquation>-periodic function that satisfies suitable conditions. Without using two-scale convergence, we prove that <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(u_\epsilon \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>u</mi> <mi>ϵ</mi> </msub> </math></EquationSource> </InlineEquation> converges weakly to some <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(u\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>u</mi> </math></EquationSource> </InlineEquation> as <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\(\epsilon \rightarrow 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ϵ</mi> <mo stretchy="false">→</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>, where <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(u\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>u</mi> </math></EquationSource> </InlineEquation> is the solution of the homogenized problem. We also give some properties of the homogenized operator.</p>

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Homogenization for an anisotropic problem

  • Ikrame Boudghene Stambouli,
  • Mohamed Mamchaoui

摘要

The purpose of this paper is to study the homogenization of the following problem \(\begin{aligned} \left\{ \begin{array}{lll} -\sum \limits _{i=0}^{N}\partial _i (a(\frac{x}{\epsilon })|\partial _{i}u_\epsilon |^{p_i-2}\partial _{i}u_\epsilon )=f_\epsilon & \text { in }\Omega , \\ u_\epsilon =0& \text { on }\partial {\Omega }, \end{array} \right. \end{aligned}\) - i = 0 N i ( a ( x ϵ ) | i u ϵ | p i - 2 i u ϵ ) = f ϵ in Ω , u ϵ = 0 on Ω , where \(\Omega \) Ω is a bounded open subset of \(\mathbb {R}^{N}\) R N with smooth boundary \(\partial {\Omega }\) Ω , \(p_i > 1\) p i > 1 for all \(i = 1 \dots N\) i = 1 N , \(\epsilon \) ϵ is a small real parameter, and \(a(\cdot )\) a ( · ) is a \(Y\) Y -periodic function that satisfies suitable conditions. Without using two-scale convergence, we prove that \(u_\epsilon \) u ϵ converges weakly to some \(u\) u as \(\epsilon \rightarrow 0\) ϵ 0 , where \(u\) u is the solution of the homogenized problem. We also give some properties of the homogenized operator.