TY - JOUR
T1 - Global regularity of generalized magnetic benard problem
AU - Yamazaki, Kazuo
N1 - Publisher Copyright:
© 2016 John Wiley & Sons, Ltd.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - We study the magnetic Bénard problem in two-dimensional space with generalized dissipative and diffusive terms, namely, fractional Laplacians and logarithmic supercriticality. Firstly, we show that when the diffusive term for the magnetic field is a full Laplacian, the solution initiated from data sufficiently smooth preserves its regularity as long as the power of the fractional Laplacians for the dissipative term of the velocity field and the diffusive term of the temperature field adds up to 1. Secondly, we show that with zero dissipation for the velocity field and a full Laplacian for the diffusive term of the temperature field, the global regularity result also holds when the diffusive term for themagnetic field consists of the fractional Laplacian with its power strictly bigger than 1. Finally, we show that with no diffusion fromthe magnetic and the temperature fields, the global regularity result remains valid as long as the dissipation term for the velocity field has its strength at least at the logarithmically supercritical level. These results represent various extensions of previous work on both Boussinesq andmagnetohydrodynamics systems.
AB - We study the magnetic Bénard problem in two-dimensional space with generalized dissipative and diffusive terms, namely, fractional Laplacians and logarithmic supercriticality. Firstly, we show that when the diffusive term for the magnetic field is a full Laplacian, the solution initiated from data sufficiently smooth preserves its regularity as long as the power of the fractional Laplacians for the dissipative term of the velocity field and the diffusive term of the temperature field adds up to 1. Secondly, we show that with zero dissipation for the velocity field and a full Laplacian for the diffusive term of the temperature field, the global regularity result also holds when the diffusive term for themagnetic field consists of the fractional Laplacian with its power strictly bigger than 1. Finally, we show that with no diffusion fromthe magnetic and the temperature fields, the global regularity result remains valid as long as the dissipation term for the velocity field has its strength at least at the logarithmically supercritical level. These results represent various extensions of previous work on both Boussinesq andmagnetohydrodynamics systems.
KW - Besov spaces
KW - Bénard problem
KW - Fractional Laplacian
KW - Global regularity
KW - Magnetic Bénard problem
UR - http://www.scopus.com/inward/record.url?scp=84994289048&partnerID=8YFLogxK
U2 - 10.1002/mma.4116
DO - 10.1002/mma.4116
M3 - Article
AN - SCOPUS:84994289048
SN - 0170-4214
VL - 40
SP - 2013
EP - 2033
JO - Mathematical Methods in the Applied Sciences
JF - Mathematical Methods in the Applied Sciences
IS - 6
ER -