Do Random Velocity Fields Inhibit or Induce Gravitational Collapse and Fragmentation?

1991 ◽  
pp. 396-397
Author(s):  
Philippe Chantry ◽  
Roland Grappin ◽  
Jacques LÉOrat
Keyword(s):  
Gravitational Collapse ◽  
Velocity Fields ◽  
Random Velocity

scholarly journals Do random velocity fields inhibit or induce gravitational collapse and fragmentation?

1991 ◽  
Vol 147 ◽  
pp. 396-397
Author(s):  
Philippe Chantry ◽  
Roland Grappin ◽  
Jacques Léorat
Keyword(s):  
Turbulent Flow ◽  
Gravitational Collapse ◽  
Velocity Fields ◽  
Turbulent Velocity ◽  
Random Velocity ◽  
Turbulent Pressure

Recent numerical works on self-gravitating turbulence (Bonazzola et al., 1987; Léorat, Passot, Pouquet 1990) tend to show that turbulent velocity fields could act as a “turbulent” pressure, i.e. inhibit the collapse of self-gravitating clouds. This effect is efficient when the caracteristic scale of the turbulent flow is small compared to the Jeans's length. When these two scales are comparable, we show (Chantry, Grappin, Léorat, 1990) that the turbulence do no more inhibit the collapse, but seems to trigger it.

scholarly journals Do random velocity fields inhibit or induce gravitational collapse and fragmentation?

1991 ◽  
Vol 147 ◽  
pp. 396-397 ◽  
Author(s):  
Philippe Chantry ◽  
Roland Grappin ◽  
Jacques Léorat
Keyword(s):  
Turbulent Flow ◽  
Gravitational Collapse ◽  
Velocity Fields ◽  
Turbulent Velocity ◽  
Random Velocity ◽  
Turbulent Pressure

Recent numerical works on self-gravitating turbulence (Bonazzola et al., 1987; Léorat, Passot, Pouquet 1990) tend to show that turbulent velocity fields could act as a “turbulent” pressure, i.e. inhibit the collapse of self-gravitating clouds. This effect is efficient when the caracteristic scale of the turbulent flow is small compared to the Jeans's length. When these two scales are comparable, we show (Chantry, Grappin, Léorat, 1990) that the turbulence do no more inhibit the collapse, but seems to trigger it.

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