The outer boundary conditions of the heliosphere: Observations and models of the local interstellar cloud

2016 ◽  
Author(s):  
Jonathan D. Slavin
Keyword(s):  
Boundary Conditions ◽  
Outer Boundary ◽  
Interstellar Cloud ◽  
Local Interstellar Cloud

The opto-mechanical design of the sub-orbital local interstellar cloud experiment (SLICE)

2013 ◽  
Author(s):  
Robert Kane ◽  
Nicholas Nell ◽  
Ted Schultz ◽  
Kevin France ◽  
Matthew Beasley ◽  
...  
Keyword(s):  
Mechanical Design ◽  
Interstellar Cloud ◽  
Local Interstellar Cloud

Investigation of heat transfer in irregular porous cavity subjected to various boundary conditions

2019 ◽  
Vol 29 (1) ◽  
pp. 418-447 ◽  
Author(s):  
Irfan Anjum Badruddin
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Outer Boundary ◽  
Governing Equations ◽  
Content Type ◽  
Porous Cavity ◽  
Various Boundary Conditions ◽  
Heating Source ◽  
Transfer Behavior ◽  
Vertical Walls

Purpose The purpose of this paper is to investigate the heat transfer in an arbitrary cavity filled with porous medium. The geometry of the cavity is such that an isothermal heating source is placed centrally at the bottom of the cavity. The height and width of the heating source is varied to analyses its effect on the heat transfer characteristics. The investigation is carried out for three different cases of outer boundary conditions such as two outside vertical walls being maintained at cold temperature To, two vertical and top horizontal surface being heated to. To and the third case with top surface kept at To but other surfaces being adiabatic. Design/methodology/approach Finite element method is used to solve the governing equations. Findings It is observed that the cavity exhibits unique heat transfer behavior as compared to regular cavity. The cases of boundary conditions are found to affect the heat transfer rate in the porous cavity. Originality/value This is original work representing the heat transfer in irregular porous cavity with various boundary conditions. This work is neither being published nor under review in any other journal.

Responses of Commingled Systems With Mixed Inner and Outer Boundary Conditions Using Derivatives

1994 ◽  
Vol 9 (04) ◽  
pp. 264-271 ◽  
Author(s):  
Gao Chao ◽  
Jack R. Jones ◽  
Rajagopal Raghavan ◽  
W. John Lee
Keyword(s):  
Boundary Conditions ◽  
Outer Boundary

Estimation of Impacts of Removing Arbitrarily Constrained Domain Details to the Analysis of Incompressible Fluid Flows

2016 ◽  
Vol 20 (4) ◽  
pp. 944-968
Author(s):  
Kai Zhang ◽  
Ming Li ◽  
Jingzhi Li
Keyword(s):  
Sensitivity Analysis ◽  
Boundary Conditions ◽  
Incompressible Fluid ◽  
Outer Boundary ◽  
Fluid Flows ◽  
Neumann Boundary ◽  
Error Estimator ◽  
Computational Domain ◽  
Fast Analysis ◽  
Incompressible Fluid Flows

AbstractRemoving geometric details from the computational domain can significantly reduce the complexity of downstream task of meshing and simulation computation, and increase their stability. Proper estimation of the sensitivity analysis error induced by removing such domain details, called defeaturing errors, can ensure that the sensitivity analysis fidelity can still be met after simplification. In this paper, estimation of impacts of removing arbitrarily constrained domain details to the analysis of incompressible fluid flows is studied with applications to fast analysis of incompressible fluid flows in complex environments. The derived error estimator is applicable to geometric details constrained by either Dirichlet or Neumann boundary conditions, and has no special requirements on the outer boundary conditions. Extensive numerical examples were presented to demonstrate the effectiveness and efficiency of the proposed error estimator.

scholarly journals Cauchy-perturbative matching and outer boundary conditions: Methods and tests

1998 ◽  
Vol 58 (4) ◽  
Author(s):  
M. E. Rupright ◽  
A. M. Abrahams ◽  
L. Rezzolla
Keyword(s):  
Boundary Conditions ◽  
Outer Boundary

scholarly journals Observations of the Local Interstellar Cloud

1997 ◽  
Vol 166 ◽  
pp. 17-28
Author(s):  
R. Lallement
Keyword(s):  
Magnetic Field ◽  
Interstellar Cloud ◽  
Local Magnetic Field ◽  
Thermal Pressure ◽  
Local Bubble ◽  
Hot Gas ◽  
Local Interstellar Cloud ◽  
Nearby Stars ◽  
Local Cloud ◽  
The Magnetic Field

AbstractConstraints on the ambient (circumsolar) interstellar medium can be derived from observations of interstellar neutrals or their derivatives in the heliosphere. New results have been recently obtained which, when combined with optical and UV observations of the nearby stars (HST-GHRS, EUVE), remove long-standing contradictions and allow us to infer for our local cloud, pressure, ionization and limits on the magnetic field. The electron density in the circumsolar gas is found to be between 0.04 and 0.15 cm−3. Its total thermal pressure is within the interval 1700 – 2600 cm−3 K. If the local magnetic field is nearly perpendicular to the interstellar wind flow, which is likely, then its intensity is smaller than 3.6 μG. Our Sun is located very close to the edge of the local cloud (the volume of gas which has the same physical properties as the circumsolar gas), while there are at least 5 other cloudlets within 10 pc. Abundances vary from cloudlet to cloudlet. How they are located and whether they are separated by tenuous gas or shock discontinuities is not clear yet. Semi-hot (105 K) gas has been detected in absorption towards nearby stars (Wood et al, 1996), which probably originates in the “H walls” surrounding our heliosphere and other asterospheres. This shows that semi-hot gas is not necessarily linked with cloud interfaces with the hot gas of the Local Bubble.

Sign in / Sign up

Export Citation Format

Share Document