Fully time accurate CFD simulations of JDAM separation from an F-18C aircraft

Noack, Ralph W.; Jolly, Bruce; Afb, Eglin

doi:10.2514/6.2000-794

Cited by 19 publications

(6 citation statements)

References 5 publications

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“…All simulations were run through t = 0.45 sec. is commensurate with previous computed results for this same configuration [9][10][11][12][13][14][15]. The degradation of the predicted angular orientation will be discussed in the next section with the time-dependent simulations results.…”

Section: Sequential-static Simulationssupporting

confidence: 88%

“…The underprediction of the separation distance after t = 0.20 is caused by the over-predicted Consistently, in both the sequential-static and time-dependent simulations, the predicted roll behavior of the JDAM does not correlate well with the flight data. This is not unique to the current work, and has been noted in previous trajectory predictions for this configuration [7][8][9][10][11][12][13][14][15]. Cenko [7] notes "[roll attitude] is the hardest to predict, fortunately has a minimal impact on the trajectory".…”

Section: Time-dependent Simulationsmentioning

confidence: 63%

“…Cenko [8]). Since even slight errors in the initial trajectory of the store can become augmented as the separation simulation is marched forward in time, researchers have modified either the ejector model [8,9], or the computed JDAM trajectory [14], in order to provide a realistic store separation. Physically, the JDAM is constrained by the ejector mechanism, which is not accounted for in simplistic models.…”

Section: Ejector Force Modelmentioning

confidence: 99%

“…Cenko [7,8]) . The JDAM separation provides an attractive demonstration case because it contains a complex aircraft geometry, flight telemetry and photographic-derived quantitative data, and also because it has been simulated by numerous other CFD methods [9][10][11][12][13][14][15]. These previous CFD simulations can be broken into two broad classes; those which computed a set of static solutions which were used with a store trajectory simulation package, and those which computed the trajectory of the store within the CFD simulation process.…”

Section: Introductionmentioning

confidence: 99%

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Simulations of 6-DOF Motion with a Cartesian Method

Murman

Aftosmis

Berger

et al. 2003

41st Aerospace Sciences Meeting and Exhibit

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Coupled 6-DOF/CFD trajectory predictions using an automated Cartesian method are demonstrated by simulating a GBU-31/JDAM store separating from an F/A-18C aircraft. Numerical simulations are performed at two Mach numbers near the sonic speed, and compared with flight-test telemetry and photographic-derived data. For both Mach numbers, simulation results using a sequential-static series of flow solutions are contrasted with results using a time-dependent approach. Both numerical approaches show good agreement with the flight-test data through the first 0.25 seconds of the trajectory. At later times the sequential-static and time-dependent methods diverge, after the store produces peak angular rates, however both remain close to the flight-test trajectory. A computational cost comparison for the Cartesian method is included, in terms of absolute CPU time, and relative to computing uncoupled 6-DOF trajectories through a pre-computed matrix of simulations. A detailed description of the 6-DOF method is provided in an appendix, along with verification studies confirming its numerical accuracy.

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Section: Sequential-static Simulationssupporting

confidence: 88%

Section: Time-dependent Simulationsmentioning

confidence: 63%

Section: Ejector Force Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulations of 6-DOF Motion with a Cartesian Method

Murman

Aftosmis

Berger

et al. 2003

41st Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

show abstract

“…The meeting was held at the AIAA Annual meeting in Reno, Nevada on January 12 th , 1999. Two other papers [24,25] that were not ready in time were presented at the AIAA 2000 meeting in Reno.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the capabilities of CFD to predict store trajectories from attack aircraft

Cenko¹,

Sisco²,

Walsh³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

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This paper explores the advantages of using computational fluid dynamics (CFD) to predict store trajectories. The focus will be on comparing CFD based store separation predictions with experimental data derived from wind tunnel and flight tests. Of particular interest are the abilities of new engineers to use various CFD packages to accurately predict store captive loads and separation forces, moments and trajectories in support of real stores clearance processes. The first phase made use of existing CF-18 Aircraft/MK-83 trajectory data from ongoing flight-tests by the Canadian Airforce.

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Experience in the use of computational aerodynamics to predict store release characteristics

Cenko

2001

Progress in Aerospace Sciences

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Fully time accurate CFD simulations of JDAM separation from an F-18C aircraft

Cited by 19 publications

References 5 publications

Simulations of 6-DOF Motion with a Cartesian Method

Simulations of 6-DOF Motion with a Cartesian Method

Evaluation of the capabilities of CFD to predict store trajectories from attack aircraft

Experience in the use of computational aerodynamics to predict store release characteristics

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