This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevE.83.046708 in citations.
Please use the identifier: http://hdl.handle.net/2128/9320 in citations.
Hydrodynamic fluctuations in thermostatted multiparticle collision dynamics
Hydrodynamic fluctuations in thermostatted multiparticle collision dynamics
In this work we study the behavior of mesoscopic fluctuations of a fluid simulated by Multiparticle Collision Dynamics when this is applied together with a local thermostatting procedure that constrains the strength of temperature fluctuations. We consider procedures in which the thermostat interact...
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Personal Name(s): | Hijar, H. |
---|---|
Sutmann, G. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC |
Published in: | Physical Review E Physical review / E, 83 83 (2011 2011) 4 4, S. 046708 046708 |
Imprint: |
College Park, Md.
APS
2011
2011-04-20 2011-04-01 |
Physical Description: |
046708 |
DOI: |
10.1103/PhysRevE.83.046708 |
Document Type: |
Journal Article |
Research Program: |
Computational Science and Mathematical Methods Scientific Computing |
Series Title: |
Physical Review E
83 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/9320 in citations.
In this work we study the behavior of mesoscopic fluctuations of a fluid simulated by Multiparticle Collision Dynamics when this is applied together with a local thermostatting procedure that constrains the strength of temperature fluctuations. We consider procedures in which the thermostat interacts with the fluid at every simulation step as well as cases in which the thermostat is applied only at regular time intervals. Due to the application of the thermostat temperature fluctuations are forced to relax to equilibrium faster than they do in the nonthermostatted, constant-energy case. Depending on the interval of application of the thermostat, it is demonstrated that the thermodynamic state changes gradually from isothermal to adiabatic conditions. In order to exhibit this effect we compute from simulations diverse correlation functions of the hydrodynamic fluctuating fields. These correlation functions are compared with those predicted by a linearized hydrodynamic theory of a simple fluid in which a thermostat is applied locally. We find a good agreement between the model and the numerical results, which confirms that hydrodynamic fluctuations in Multiparticle Collision Dynamics in the presence of the thermostat have the properties expected for spontaneous fluctuations in fluids in contact with a heat reservoir. |