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In [[vector analysis]], a mathematical discipline, a '''poloidal–toroidal decomposition''' of a three-dimensional [[solenoidal vector field]] '''F''' writes it as a sum of a [[toroidal and poloidal|poloidal vector field and a toroidal vector field]]: | |||
: <math>\mathbf{F} = \nabla \times \Psi \mathbf{r} + \nabla \times (\nabla \times \Phi \mathbf{r}), </math> | |||
Thus, the vector field can be considered to be generated by a pair of [[scalar potential]]s Ψ and Φ. This [[vector decomposition|decomposition]] is analogous to a [[Helmholtz decomposition]], and has been used in [[dynamo theory]]. | |||
== Poloidal and toroidal vector fields == | |||
A vector field <math> \mathbf{F} </math> is called toroidal if it can be written as <math> \mathbf{F} = \nabla \times \Psi \mathbf{r} </math> for some scalar field <math> \Psi </math>.{{sfn|Backus|1986|p=87}} Every toroidal field is solenoidal, because the divergence of the curl vanishes. A solenoidal vector field <math> \mathbf{F} </math> is toroidal if and only if it is tangential to spheres around the origin (<math> \mathbf{F} \cdot \mathbf{r} = 0 </math>).{{sfn|Backus|Parker|Constable|1996|p=178}} | |||
A vector field <math> \mathbf{F} </math> is called poloidal if it is the curl of a toroidal field; in other words, if there is a scalar field <math> \Phi </math> such that <math> \mathbf{F} = \nabla \times \nabla \times \Phi \mathbf{r} </math>.{{sfn|Backus|1986|p=88}} Thus, the curl of a toroidal field is poloidal; reversibly, the curl of a poloidal field is toroidal.{{sfn|Backus|Parker|Constable|1996|p=178}} This leads to another characterization of poloidal vector fields: a solenoidal vector field is poloidal if and only if its curl is tangential to spheres around the origin.{{sfn|Backus|Parker|Constable|1996|p=179}} | |||
== The decomposition == | |||
Every solenoidal vector field <math> \mathbf{F} </math> can be written as the sum of a toroidal and poloidal field. This decomposition is unique if it is required that the average of the scalar fields <math> \Psi </math> and <math> \Phi </math> vanishes on every sphere of radius <math> r </math>.{{sfn|Backus|1986|p=88}} | |||
Poloidal–toroidal decompositions also exist in Cartesian coordinates, but a mean-field flow has to included in this case. For example, every solenoidal vector field can be written as | |||
: <math>\mathbf{F}(x,y,z) = \nabla \times g(x,y,z) \hat{\mathbf{z}} + \nabla \times (\nabla \times h(x,y,z) \hat{\mathbf{z}}) + b_x(z) \hat{\mathbf{x}} + b_y(z)\hat{\mathbf{y}}, </math> | |||
where <math>\hat{\mathbf{x}}, \hat{\mathbf{y}}, \hat{\mathbf{z}}</math> denote the unit vectors in the coordinate directions.{{sfn|Jones|2008|p=62}} | |||
==See also== | |||
* [[Toroidal and poloidal]] | |||
== Notes == | |||
{{reflist}} | |||
== References == | |||
* [http://cdsads.u-strasbg.fr/abs/1984JCoPh..55..461G Numerical simulations of stellar convective dynamos. I — The model and method], Glatzmaier, G. A.; Journal of Computational Physics, vol. 55, Sept. 1984, pp. 461–484. | |||
* [http://cdsads.u-strasbg.fr/abs/1961hhs..book.....C ''Hydrodynamic and hydromagnetic stability''], Chandrasekhar, Subrahmanyan; International Series of Monographs on Physics, Oxford: Clarendon, 1961, p. 622. | |||
* [http://www.springerlink.com/content/h584m7h23v1k5428/ Decomposition of solenoidal fields into poloidal fields, toroidal fields and the mean flow. Applications to the boussinesq-equations], Schmitt, B. J. and von Wahl, W; in ''The Navier-Stokes Equations II — Theory and Numerical Methods'', pp. 291–305; Lecture Notes in Mathematics, Springer Berlin/ Heidelberg, Vol. 1530/ 1992. | |||
* [http://cdsads.u-strasbg.fr/abs/1999ApJS..121..247L Anelastic Magnetohydrodynamic Equations for Modeling Solar and Stellar Convection Zones], Lantz, S. R. and Fan, Y.; The Astrophysical Journal Supplement Series, Volume 121, Issue 1, Mar. 1999, pp. 247–264. | |||
* Plane poloidal-toroidal decomposition of doubly periodic vector fields: [http://www.austms.org.au/Publ/Jamsb/V47P1/2148.html Part 1. Fields with divergence] and [http://www.austms.org.au/Publ/Jamsb/V47P1/2203.html Part 2. Stokes equations]. G. D. McBain. [http://www.austms.org.au/Publ/ANZIAM/index.shtml ANZIAM J.] [http://www.austms.org.au/Publ/ANZIAM/V47P1/contents.html 47 (2005)] | |||
* {{citation | first = George | last = Backus | title = Poloidal and toroidal fields in geomagnetic field modeling | journal = Reviews in Geophysics | volume = 24 | year = 1986 | pages = 75–109 | doi = 10.1029/RG024i001p00075 }}. | |||
* {{citation | first1 = George | last1 = Backus | first2 = Robert | last2 = Parker | first3 = Catherine | last3 = Constable | title = Foundations of Geomagnetism | publisher = Cambridge University Press | year = 1996 | isbn = 0-521-41006-1 }}. | |||
* {{citation | first = Chris | last = Jones | title = Course 2: Dynamo Theory | booktitle = Dynamos: Lecture Notes of the Les Houches Summer School 2007 | isbn = 9780080548128 | publisher = Elsevier | doi = 10.1016/S0924-8099(08)80006-6 | year = 2008 }}. | |||
{{DEFAULTSORT:Poloidal-toroidal decomposition}} | |||
[[Category:Vector calculus]] |
Revision as of 21:10, 5 September 2013
In vector analysis, a mathematical discipline, a poloidal–toroidal decomposition of a three-dimensional solenoidal vector field F writes it as a sum of a poloidal vector field and a toroidal vector field:
Thus, the vector field can be considered to be generated by a pair of scalar potentials Ψ and Φ. This decomposition is analogous to a Helmholtz decomposition, and has been used in dynamo theory.
Poloidal and toroidal vector fields
A vector field is called toroidal if it can be written as for some scalar field .Template:Sfn Every toroidal field is solenoidal, because the divergence of the curl vanishes. A solenoidal vector field is toroidal if and only if it is tangential to spheres around the origin ().Template:Sfn
A vector field is called poloidal if it is the curl of a toroidal field; in other words, if there is a scalar field such that .Template:Sfn Thus, the curl of a toroidal field is poloidal; reversibly, the curl of a poloidal field is toroidal.Template:Sfn This leads to another characterization of poloidal vector fields: a solenoidal vector field is poloidal if and only if its curl is tangential to spheres around the origin.Template:Sfn
The decomposition
Every solenoidal vector field can be written as the sum of a toroidal and poloidal field. This decomposition is unique if it is required that the average of the scalar fields and vanishes on every sphere of radius .Template:Sfn
Poloidal–toroidal decompositions also exist in Cartesian coordinates, but a mean-field flow has to included in this case. For example, every solenoidal vector field can be written as
where denote the unit vectors in the coordinate directions.Template:Sfn
See also
Notes
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References
- Numerical simulations of stellar convective dynamos. I — The model and method, Glatzmaier, G. A.; Journal of Computational Physics, vol. 55, Sept. 1984, pp. 461–484.
- Hydrodynamic and hydromagnetic stability, Chandrasekhar, Subrahmanyan; International Series of Monographs on Physics, Oxford: Clarendon, 1961, p. 622.
- Decomposition of solenoidal fields into poloidal fields, toroidal fields and the mean flow. Applications to the boussinesq-equations, Schmitt, B. J. and von Wahl, W; in The Navier-Stokes Equations II — Theory and Numerical Methods, pp. 291–305; Lecture Notes in Mathematics, Springer Berlin/ Heidelberg, Vol. 1530/ 1992.
- Anelastic Magnetohydrodynamic Equations for Modeling Solar and Stellar Convection Zones, Lantz, S. R. and Fan, Y.; The Astrophysical Journal Supplement Series, Volume 121, Issue 1, Mar. 1999, pp. 247–264.
- Plane poloidal-toroidal decomposition of doubly periodic vector fields: Part 1. Fields with divergence and Part 2. Stokes equations. G. D. McBain. ANZIAM J. 47 (2005)
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Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.
In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.
Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region
Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.
15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.
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