Links - Online Tools

This section provides a selection of the most useful online calculators for people working with CFD. To suggest a link to be included in this section please use the online link suggestion form. You are of course also welcome to contact us directly via email at webmaster@cfd-online.com.

Contents:

• Unit Converters
• Calculators
• y+ Estimation
• Compressible Flow
• Heat Transfer
• Airfoil Generators
• Simple Cases - Pipes, Channels etc.
• Combustion
• Cycles and Processes

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Unit Converters

Unit Conversion Calculator

A fairly complete unit converter in javascript that is easy to use.

Calculators

RPN Calculator (click to open a small new window)

A scientific RPN calculator written in JavaScript. Has a clean interface and many functions. Use it whenever you haven't got your HP around.

Scientific Calculator (click to open a small new window)

A scientific calculator written in JavaScript. Works well for those of you who don't like reverse polish notation.

Calculatur Pi

A nice scientific calculator that creates a sequence of your calculations that can be used later or printed afterwards.

y+ Estimation

y+ Estimation

Estimates the wall distance needed to obtain a desired y+ value. Uses free-steam velocity and gas-data and works well for both incompressible and compressibe flows.

Viscous Grid Spacing Calculator

A JavaScript that helps you to estimate at what normal distance from a wall you should place your first grid-line. This is one of those wonderful little tools that saves you from learning a formula! Mainly suited for compressible flows.

Compressible Flow

Compressible Aerodynamics Calculator

A JavaScript to compute standard relations for compressible flow of a perfect gas. Five sets of relations are included; isentropic flow, normal shocks and oblique shocks, Fanno Flow and Rayleigh Flow . Written by William Devenport. You can find more applets at their engAPPLETS site.

Heat Transfer

The Thermal Wizard

A very nice collection of online calculators provided by Maya Heat Transfer Technologies. The main focus is on heat transfer applications - conduction, convection and radiation in simple geometries. You can also find material data, a unit converter and a few simple head-loss computations.

Heat Transfer Between Two Co-annular Pipes

Computes the 1D radial heat transfer between two co-annular gas streams. The user selects gases, the wall type between the pipes, pipe radii and flow properties (mass-flow, temperature and pressure). The tool accounts for both convection and radiation (gas and soot).

Airfoil Generators

For general information and airfoil links see the References > Airfoils section.

JavaFoil

An applet that can generate and analyze a large number of different airfoils, including NACA 4,5 and 6 series. A very nice tool written by Dr. Martin Hepperle.

NACA 4 & 5 series Profile Generators

Simple applets written by Jens Trapp.

PROFOIL-WWW

An interactive WWW version of PROFOIL - a low-speed airfoil inverse design code by Michael S. Selig.

Simple Cases, Pipes, Channels etc.

Pipes, Channels, Hydrology, Groundwater, Tank volume and more

Many small java-applets from LMNO Engineering. You have to pay a fee to get access to all but there are many free calculators also. Nice.

Pipe Flow Calculations

A large collection of free tools for pipe flow. This site has been online for many years and it gets better and better. It is a bit too filled with Google ads and this makes it a bit confusing to browse, but it is still a very good resource if you are looking for pipe calculations.

Combustion

Combustion Tool

Computes the mixing and combustion of two gas streams. Both complete combustion and chemical equilibrium applying the NASA method are calculated. Fluids, massflows, temperatures and pressure are input data. User-defined fluids using a species database (NASA polynomials). Computes exit species and temperature. Results can be download also in pdf and csv format.

Cycles and Processes

Power Cycle Analysis Online Calculator

Computes efficiencies etc. for various thermodynamic cycles - Carnot cycle, Brayton cycle, Otto Cycle, Diesel Cycle, Magentohydrodanmics ... Provided by Engineering Software as a part of their Free Online Calculators section.

Power Cycle Components/Processes Online Calculator

Simple calculators for the following basic cycle components: isentropic compression, stoichiometric combustion (Coal/Oil and Gas) and isentropic expansion. Provided by Engineering Software as a part of their Free Online Calculators section.