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arXiv 2210.09800math.AP
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非线性三维热弹性力学中的全局弱解

Global weak solutions in nonlinear 3D thermoelasticity

Tomasz Cieślak, Boris Muha, Srđan Trifunović

AI总结:

本文研究符合热力学定律的三维非线性热弹性双曲-抛物系统,通过引入热力学合理变量转化为熵平衡形式,提出带缺陷测度的弱解概念,首次证明大初值下全局存在性、一致性及弱-强唯一性。

摘要:

本文研究一类非线性热弹性力学双曲-抛物系统,该系统描述导热弹性体的动量平衡与内能平衡,且能保持温度的正性。截至目前,此类自然情形下尚无全局存在性结果。我们的结果通过引入符合热力学原理的变量得到,这些变量可推导出等价系统,其中内能平衡被熵平衡所替代。针对该系统,我们提出了带缺陷测度的弱解概念,这类弱解满足熵不等式(而非平衡方程),且温度几乎处处为正。随后,我们在热容与热导率均为常数或均为非常数的情形下,证明了全局存在性、一致性以及弱-强唯一性。需要指出的是,这是首个在模型完全符合热力学定律的非线性热弹性力学中,针对大初值的全局存在性结果。

英文摘要:

Here we study a nonlinear thermoelasticity hyperbolic-parabolic system describing the balance of momentum and internal energy of a heat-conducting elastic body, preserving the positivity of temperature. So far, no global existence results in such a natural case were available. Our result is obtained by using thermodynamically justified variables which allow us to obtain an equivalent system in which the internal energy balance is replaced with entropy balance. For this system, a concept of weak solution with defect measure is introduced, which satisfies entropy inequality instead of balance and has a positive temperature almost everywhere. Then, the global existence, consistency and weak-strong uniqueness are shown in the cases where heat capacity and heat conductivity are both either constant or non-constant. Let us point out that this is the first result concerning global existence for large initial data in nonlinear thermoelasticity where the model is in full accordance with the laws of thermodynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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