F/A-18C/JDAM Applied Computational Fluid Dynamics Challenge II results

Cenko, A.; Gowanlock, Dereck; Lutton, Major M.; Tutty, M.

doi:10.2514/6.2000-795

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…This transonic JDAM separation was put forward by the Navy as a "challenge" to the CFD community because it exhibited behavior that could not reliably be predicted with conventional store separation analysis tools (cf. 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].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…The example presented shows the release of a JDAM from a F/A-18C, which has been selected as a common test case in the Applied CFD Challenge II [17,34]. Both release conditions are listed in Table I. For Case 1 the time-accurate simulation lasted 10.4 h on 24 Intel XEON processors running at 2.66 GHz, the parts required for the di erent tasks are summarized in Table II.…”

Section: Applicationsmentioning

confidence: 99%

“…This type of simulation has become increasingly relevant in the aerospace industry over the last years [17]. Typical applications involve meshes consisting of millions of mesh points to represent the highly detailed geometric models with the necessary level of accuracy and to obtain an accurate ow solution.…”

Section: Introductionmentioning

confidence: 99%

Parallel remeshing of unstructured volume grids for CFD applications

Tremel¹,

Sørensen²,

Hitzel³

et al. 2006

Numerical Methods in Fluids

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SUMMARYThis paper presents a new approach towards the parallel local remeshing of unstructured tetrahedral grids on distributed memory parallel computers based on the message passing paradigm (MPI). The overall remeshing approach consisting of the parallel determination of the regions to be remeshed and the parallel local surface and volume remeshing is described in detail. An application of the remeshing algorithms in a time-accurate simulation of bodies in relative motion demonstrates the capabilities of the approach.

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“…The terms appearing in Equation 9 are evaluated in the same manner as the viscous terms in Equation 1. Given an initial guess, u 0 , write the displacement as u = u 0 + ∆u.…”

Section: Mesh Deformationmentioning

confidence: 99%

“…The range of applications in which moving geometries are essential is quite broad; a very short list includes store separation, 1 rotorcraft, 2 flutter analysis, 3 and maneuvering aircraft. 4 Depending on the particular application, different types of mesh motion schemes within the CFD solver may be needed.…”

Section: Introductionmentioning

confidence: 99%

Recent Enhancements to the FUN3D Flow Solver for Moving-Mesh Applications

Biedron

Thomas

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

122

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An unsteady Reynolds-averaged Navier-Stokes solver for unstructured grids has been extended to handle general mesh movement involving rigid, deforming, and overset meshes. Mesh deformation is achieved through analogy to elastic media by solving the linear elasticity equations. A general method for specifying the motion of moving bodies within the mesh has been implemented that allows for inherited motion through parent-child relationships, enabling simulations involving multiple moving bodies. Several example calculations are shown to illustrate the range of potential applications. For problems in which an isolated body is rotating with a fixed rate, a noninertial reference-frame formulation is available. An example calculation for a tilt-wing rotor is used to demonstrate that the time-dependent moving grid and noninertial formulations produce the same results in the limit of zero time-step size.

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F/A-18C/JDAM Applied Computational Fluid Dynamics Challenge II results

Cited by 10 publications

References 6 publications

Simulations of 6-DOF Motion with a Cartesian Method

Simulations of 6-DOF Motion with a Cartesian Method

Parallel remeshing of unstructured volume grids for CFD applications

Recent Enhancements to the FUN3D Flow Solver for Moving-Mesh Applications

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