SEARCH · Engineering Papers
Results for “ROUGHNESS”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Measuring Skew in Average Surface Roughness as a Function of Surface Preparation
No abstract available
Humans to Mars Will Cost About "Half a Trillion Dollars" and Life Support Roughly Two Billion Dollars
A recent estimate of the cost of the first human mission to Mars suggests that it could cost half a trillion dollars. This estimate is consistent with most past estimates. A similar cost number can easily be derived using mass-cost estimating factors based on the International Space Station (ISS) and other experience. Using the same cost factors and life cycle cost estimating approach, the cost of the life support for the Mars mission could be two billion dollars or more. The cost to go to Mars is expected to be two or three times that of either Apollo, space shuttle, or ISS and could be as much as all three together.
Illumination and Temperature on Rough Terrain: Fast Methods for Solving the Radiosity Equation
No abstract available
DNS of Laminar to Turbulent Transition on NACA 0012 Airfoil with Sand Grain Roughness
The Lattice-Boltzmann-based solver PowerFLOW is used to perform direct numerical simulations of the transitional flow over an airfoil at Reynolds number equal to 0.657 million. The leading edge of the airfoil is covered with sand particles, represented by polyhedra, to mimic the grit used in experiments. The sensitivity of the laminar to turbulent transition to the size of these particles, grid resolution, spanwise length is evaluated and rectangular trips are also tested.
Effects of 3D Roughness Patch on Transition in High-Speed Boundary Layers
No abstract available
Transition due to Patterns of Roughness on a Supersonic Flat Plate
Explore the source record for details and available documents.
Relating Vegetatin Aerodynamic Roughness Length to Interferometric SAR Measurements
UNKNOWN
An Ultra-light Weight Perching System for Sloped or Vertical Rough Surfaces on Mars
No abstract provided
3d Kinematic Passive-steering Control with Roll Compensation for Rover Trajectory Following Over Rough Terrain
No abstract provided
Progress Toward Evaluating Roughness-Resolved Aerothermodynamic Simulations for the Mars Sample Return Earth Entry System
Explore the source record for details and available documents.
Discrete Roughness Boundary-Layer Transition at Hypersonic Conditions
Explore the source record for details and available documents.
High Value Science Return using Low-Cost Orbiters and Rough Landers at Mars
No abstract provided