Divergence theorem for inner product of Tensor












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Let $Omegasubset mathbb{R}^3$ be bounded domain and $f$ be smooth vector field on $Omega$ and $f|_{partialOmega=0}$. I not able to compute $int _{Omega} grad~f:(grad~f)^{T}$, where $:$ is inner product define by $A:B=Tr(AB^{T})$. I would like to use Divergence theorem, but I do not know hoe to do it.










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  • $begingroup$
    Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
    $endgroup$
    – md2perpe
    Jan 3 at 19:51
















0












$begingroup$


Let $Omegasubset mathbb{R}^3$ be bounded domain and $f$ be smooth vector field on $Omega$ and $f|_{partialOmega=0}$. I not able to compute $int _{Omega} grad~f:(grad~f)^{T}$, where $:$ is inner product define by $A:B=Tr(AB^{T})$. I would like to use Divergence theorem, but I do not know hoe to do it.










share|cite|improve this question









$endgroup$












  • $begingroup$
    Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
    $endgroup$
    – md2perpe
    Jan 3 at 19:51














0












0








0





$begingroup$


Let $Omegasubset mathbb{R}^3$ be bounded domain and $f$ be smooth vector field on $Omega$ and $f|_{partialOmega=0}$. I not able to compute $int _{Omega} grad~f:(grad~f)^{T}$, where $:$ is inner product define by $A:B=Tr(AB^{T})$. I would like to use Divergence theorem, but I do not know hoe to do it.










share|cite|improve this question









$endgroup$




Let $Omegasubset mathbb{R}^3$ be bounded domain and $f$ be smooth vector field on $Omega$ and $f|_{partialOmega=0}$. I not able to compute $int _{Omega} grad~f:(grad~f)^{T}$, where $:$ is inner product define by $A:B=Tr(AB^{T})$. I would like to use Divergence theorem, but I do not know hoe to do it.







real-analysis vector-analysis trace divergence






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asked Jan 2 at 18:26









lojdmojlojdmoj

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877












  • $begingroup$
    Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
    $endgroup$
    – md2perpe
    Jan 3 at 19:51


















  • $begingroup$
    Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
    $endgroup$
    – md2perpe
    Jan 3 at 19:51
















$begingroup$
Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
$endgroup$
– md2perpe
Jan 3 at 19:51




$begingroup$
Without having a specific $f$ you cannot get a value. For example, if $f$ satisfies the conditions then so does $lambda f$ and the integral for this will be $|lambda|^2$ times the one for $f$.
$endgroup$
– md2perpe
Jan 3 at 19:51










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