VIPER 5.5 Code

VIPER (Viscous Interaction Performance Evaluation Routine) was originally developed to help assess boundary layer interactions for high area ratio nozzles. Since the release of Version 3.6, there have been many improvements and corrections made to the that version.

Given below is a brief summary of upgrades and enhancements contained in Version 5.5

New in VIPER 5.5

A new Subsonic Transonic Navier-Stokes Solver

  • Includes full mixing of striations in LRE’s.
  • Includes two phase flow with finite rate chemistry, a new breakup model, and phase change.

Features of VIPER 5.5

Two-Phase flow

New GUI based on Python for Windows and Linux

The two-phase transonic module TRAN2P was incorporated into the VIPER code

A slip wall boundary condition

STS (Full Two_phase Flow Navier-Stokes Solver) option for the transonic with film cooling and added option for two slot injection ports

New Breakup and Agglomeration models based on the TAB (Taylor Analogy Breakup) Model

Increased maximum number of species (from 40) to a user input value

Option to use either JANNAF Thermodynamic file (5-coefficient fit for specific heat) or CEA Thermodynamic database (7-coefficient fit for specific heat)

MPI version for STS to reduce the run time if the STS module is extended to the exit plane (Available on Linux platform only)

Added capability for domain decomposition for extending STS to the exit plane (more efficient for Linux-MPI)

Added phase change capability to STS module (Especially needed for extended STS solution to the exit plane)

Damping control at the symmetry centerline allows for a wider range of problems to be solved

A source flow option is available

Standard LINPAC matrix routines are incorporated into the basic matrix solvers so that users can take advantage of machine optimized versions of these routines.

In order to view the results of the calculations effectively Viper 5.5 writes output files for TecPlot and ParaView graphics packages

An interface which transfers nozzle exit plane flow properties from VIPER to SPF-3, the Standard Plume Flowfield computer program is available

The PNS wall boundary conditions allow a steady state temperature be calculated for a radiation cooled nozzle

Film Cooling in the PNS module

Post-processing with Tecplot program

option to combine STS and PNS solutions for both phases into a single Tecplot formatted file

Auxiliary calculations and output have been added so that total flow properties for a Pitot tube probe are available. The method assumes frozen flow through a normal shock, followed by stagnation

Near plume flowfield option to allows the computation to proceed past the nozzle exitplane for one or two nozzle exit radii

Available on Windows and Linux platforms.

Soot Model - Transonic/Supersonic(Top Left)- Droplet Breakup and Phase Change (Upper Right), MPI for Soot Model