The development of the next generation of more effective CFD software is proposed. The discretization will initially be based on the well-proven TVD schemes on a "grid-transparent" geometry framework that unifies the treatment of Cartesian, structured and unstructured meshes and patched aligned,… More

A methodology for obtaining substantial convergence acceleration for numerical simulation of predominantly supersonic flows is proposed. It is based on recently introduced preconditioning techniques and novel implementation based on unified space/time marching through appropriate relaxation… More

A fully automatic Cartesian unstructured mesh is coupled to body-conforming surface-layer mesh to result in a computational grid that is consistent with a unified-grid CFD capability. This will result in the ability to simulate even high Reynolds number viscous flows. The Cartesian mesh is… More

A methodology for obtaining substantial convergence acceleration for numerical simulation of predominantly supersonic flows is proposed. It is based on recently introduced preconditioning techniques and novel implementation based on unified space/time marching through appropriate relaxation… More

Successful application of pulsed detonation wave engine for rocket propulsion bringswith it reduced engine weight, precise control over impulse, ability to operate in acontinuous or intermittent mode and ease of maintenance. The proposed effort addressesthe critical issues in the development of… More

Metacomp Technologies, Inc. proposes to develop an innovative computational design technologyaimed at enhancing combustor efficiency. Using the advanced simulation tool CFD++, developedthrough partial SBIR funding from Wright Labs, the dynamical interaction among acoustics,flow unsteadiness,… More

"Successful application of pulsed detonation wave engine for rocket propulsion brings with it increased payload, precise control over impulse, ability to operate in a continuous or intermittent mode and ease of maintenance. The proposed effort addressessome critical issues in the development of… More

"A design tool is proposed, capable of quick identification of the parameter space leading to excessive flow oscillations in gas turbine combustors and augmentors. The tool is based on proper reduction of the original 3D flow path topology to an equivalent2D/axisymmetric slice which retains the… More

Several problem types related to missile boost phase tranisent phenomena will be studied to evaluate the effectiveness of high-fidelity physics-based CFD tool. Innovative use of unified grid approaches and unsteady formulations in simulating missileplume transient events is expected as the… More

A useful computational simulation tool will be developed to help systematicallystudy one or more advanced cooling techniques or concepts related to the use of hydrocarbon fuels in rocket engines. A coking model will be added to a general purpose computational fluid dynamics solver. The coking… More

Future hydrocarbon-based rocket engines are expected to involve very high pressure heated fuel and oxygen mixtures. A clear design goal is the optimization of fuel injection in order to maximize mixing in smaller and lighter engines. High pressureinjection may also mean operating with a flow of… More

A computational simulation software framework is being created to help model all transient events of importance associated with a missile in flight. A key focus is on the development of specific capabilities for a useful subset of missile plume transient phenomena so that these problems can be… More

Metacomp Technologies demonstrated in Phase I a preliminary capability to model thermal decomposition of rocket fuels. The ability to model bulk reaction in liquid fuels and fuel mixtures was developed. It can help simulate fuel flow through complex flow passages and is coupled to a conjugate… More

In Phase I, Metacomp Technologies developed a robust multi EOS (Equation of State) capability. Validation studies show excellent performance in the purely supercritical flow regime. Phase II will add multi-phase flow capabilities and will extend the range of applicability onto sub-critical operation… More

Metacomp Technologies proposes an innovative approach to simulate, through modeling, the effect of flow-control actuators on the flow. In this approach the underlying flow is simulated using URANS (Unsteady Reynolds Averaged Navier Stokes) or LES (Large Eddy Simulation). The flow induced by the… More

Prediction of acoustic noise generation in actual gas turbine combustors is made difficult by the interaction of fuel jet/droplet breakup, turbulent mixing and combustion with large -scale flow oscillations. Current methodologies rely either on fast and easy-to- implement, albeit less accurate,… More

The proposed effort can provide the framework for a unified modeling & simulation program to substantially improve the capability for understanding, analyzing, and predicting the underlying mechanisms dictating the combustion stability characteristics of liquid-propellant rocket engines. Emphasis… More

Prediction of the propulsive performance of a pure tube PDE is of great interest in order to understand and improve the design of an engine in a parametric space comprising geometric parameters, fuel type, degree of mixing and detonation initiation method. Metacomp Technologies, Inc., proposes a… More

Combusting flows in general, and scramjet flows in particular, strain the performance of existing CFD solvers to their limit, the weakest link being the turbulence closure. Prediction of high-speed combusting flows is particularly sensitive to the level of accuracy in computing mass transport.… More

The proposed effort provides a unified modeling & simulation framework to substantially improve the capability for understanding, analyzing, and predicting the underlying mechanisms dictating the combustion stability characteristics of liquid-propellant rocket engines. Emphasis will be placed on… More

In Phase I Metacomp Technologies, Inc. developed PDE++, a CFD-based performance prediction tool capable of multi-cycle simulation of single tube engines. Capabilities to address cross-talk in a multi-tube engine and liquid fuel injection are planned for Phase II. The final code will include all… More

Metacomp Technologies proposes to take advantage of the achieved enhancements to computational fluid dynamics capabilties and opportunities presented by developments in related disciplines, to proceed with the development of a unified multiphysics capability for scramjet applications that will… More

Metacomp Technologies proposes to explore, evaluate, select and implement several improvements in fidelity and computational effectiveness to enhance continuum modeling approaches for near-transitional flow regime.

When using the current state-of-the-art in spatial discretization, numerical flux functions and temporal integration techniques, the amount of effort required for simulations in general geometries is prohibitively large for most unsteady flow simulations in multi-element rocket engines. In addition,… More

The occurrence of combustion instability has long been a matter of serious concern in the development of liquid-propellant rocket engines due to the high rate of energy release in a confined volume in which energy losses are relatively small. Shear layer instabilities and intermittent growth rates… More

The occurrence of combustion instability has long been a matter of serious concern in the development of liquid-propellant rocket engines due to the high rate of energy release in a confined volume in which energy losses are relatively small. Positive feedback between the acoustic waves and… More

Metacomp Technologies proposes to use a near-body fine mesh DNS sub-domain, coupled to a hybrid URANS/LES-type grid in the rest of the flowfield. Statistically-steady solutions will first be computed over a domain large enough to tolerate the imposition of ambient or freestream conditions at… More

Metacomp Technologies has demonstrated, in Phase I, improvements to continuum approaches that can achieve higher fidelity in modeling the near-transitional flow regime. In Phase II, the new approach will be enhanced further, and additional possibilities explored. Improvements to the simulation… More

The goal of the activity is to increase simulation fidelity in predicting the fluid dynamics and plasma environment in the vicinity of reentry vehicle configurations. We begin with our current implementation of thermal equilibrium and non-equilibrium chemistry capability that includes the effects… More

ABSTRACT: When using the current state-of-the-art in spatial discretization, numerical flux functions and temporal integration techniques, the amount of effort required for simulations in general geometries is prohibitively large for most unsteady simulations in multi-element rocket engines. In… More

Metacomp Technologies, Inc. proposes a new 3D plume simulation tool to add another level of sophistication to MDA's IR scene generation capabilities. The new tool will provided an automated capability to obtain 3D solutions for relevant missile plume flow fields including angle-of-attack… More

Metacomp proposes the development of a new class of efficient methods to incorporate the 3D and transient effects of vernier deployment into a base plume flow field. The methods are based on a hierarchical approach. Members of the hierarchy will be evaluated to establish their efficiency versus… More