# All posts by Yuki Minamoto

## Lesson 3 — Keyboard shortcut

There are many keyboard shortcuts used in Flowsquare. Note these keyboard operations are detected once in a transition between displays from an old time step (eg. n-1) to a new time step (eg. n), and the operation is reflected in display for the next time step (eg. n+1). Continue reading

## Lesson 2.3 — grid.txt

All parameters considered for solving the governing equations in Users’ Guide are specified in grid.txt. In grid.txt, all lines except line separators consist of 3 blocks. For example, first three lines of grid.txt look something like this: Continue reading

## Lesson 2.2 — ic.bmp

Initial conditions (I.C.) are as important as boundary conditions. In Flowsquare, however, initial conditions are set according to the B.C. set in bc.bmp and the initial values specified as following variables in grid.txt. Continue reading

## Lesson 2.1 — bc.bmp

In this page, we will learn how to set boundary conditions (B.C.) for simulations so that you can set up your own simulation from scratch. However, you are recommended to find a similar case from Sample Problems, and modify its input files (bc.bmp, grid.txt, etc.) to suit your case. Continue reading

## Lesson 1.4 — Post-analysis mode

In Lessons 1.1-1.3, we learnt how to run simulations and the meanings of some of parameters specified in grid.txt. We also run simulations using the low order scheme (case name: Ch0) and the high order scheme (case name: Ch1). In this lesson, we will compare these two results by using post-analysis mode included in Flowsquare.

## Lesson 1.3 — Stability and Accuracy (channel flow cont. from L1.1)

In the previous two lessons, we leant how to start simulation (Lesson 1.1), and some of display operations (Lesson 1.2). In Lesson 1.2, we also observed there are numerical oscillations in the velocity and vorticity fields (Figs. 9 and 10 of Lesson 1.2). In this lesson, we will learn how to set some of parameters in grid.txt for better accuracy and/or numerical stability.