https://github.com/bocchio01/cfd_simulation_engine
A compact but flexible CFD engine. Entirely written in C.
https://github.com/bocchio01/cfd_simulation_engine
cfd-solvers engine lid-driven-cavity
Last synced: 3 months ago
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A compact but flexible CFD engine. Entirely written in C.
- Host: GitHub
- URL: https://github.com/bocchio01/cfd_simulation_engine
- Owner: Bocchio01
- License: mit
- Created: 2024-02-09T07:54:49.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2024-04-13T01:28:42.000Z (about 1 year ago)
- Last Synced: 2025-01-22T10:24:11.585Z (4 months ago)
- Topics: cfd-solvers, engine, lid-driven-cavity
- Language: C
- Homepage: https://bocchio01.github.io/CFD_Simulation_Engine/
- Size: 5.91 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
> [!CAUTION]
> Unfortunately, the code still doesn't work properly (needs for too low under-relaxation factors for convergence).
# Lid-driven cavity incompressible flow (steady state)
This assignment was about solving the well known **2D lid-driven cavity incompressible flow (steady state)** problem using different algorithms and schemes.
Lid-driven cavity incompressible flow solution
## Problem statement
The problem consists in a square cavity with a lid moving at a constant velocity.
The flow is incompressible and Reynolds number is low (Re <= 1000).
**Navier-Stokes** equations and the **pressure-velocity coupling** are used to solve the problem.
## Methods and schemes
The code is able to solve the problem using various methods and schemes.
In particular, we can choose the following options:
- Methods:
- **Gauss-Siedel (SCGS)**
- **SIMPLE** (not implemented yet)
- Schemes:
- **Convection schemes**:
- UDS
- CDS
- QUICK
- Hybrid (not implemented yet)
- **Diffusion schemes**:
- Second order central difference
- Fourth order central difference
## Data input
The code reads the input parameters from a file in JSON format.
```json
{
"in": {
"uLid": 1.0,
"geometry": {
"x": 1.0,
"y": 1.0
},
"fluid": {
"Re": 1000
}
},
"engine": {
"mesh": {
"nodes": {
"Nx": 80,
"Ny": 80
}
},
"method": {
"tolerance": 1e-05,
"maxIter": 5000,
"under_relaxation": {
"u": 0.08,
"v": 0.08
}
},
"schemes": {
"convection": "QUICK",
"diffusion": "SECOND"
}
}
}
```
### CMD input
From the command line, the possible input arguments are:
- `-h` or `--help` to print the help
- `-v` or `--version` to print the version
- `-i` or `--in` to specify the input file path (relative or absolute). Default: `-i simulations/input/input.json`
- `-f` or `--format` to specify the out file format. Default: `-f DAT`
## Output
The output is saved in a `DAT` file and it is possible to visualize it using the `MATLAB` script provided in the `simulations/plotting` folder.
An example of the output file is:
```bash
07_80_80_1000_QUICK_SECOND_008_008
RE=1000.000000
ITERATIONS=5001
CPU_TIME=119.330000
RESIDUALS=0.000000 0.128145 0.122590 ...
VARIABLES="X", "Y", "U", "V", "P"
ZONE F=POINT, I=80, J=80
0.006250,0.006250,0.000017,-0.000021,0.044281
0.018750,0.006250,0.000113,-0.000085,0.044314
0.031250,0.006250,0.000310,-0.000123,0.044337
0.043750,0.006250,0.000558,-0.000137,0.044344
...
```
## How to...
### Clone/Download the repository
You can clone the repository either using git or downloading the zip file from the button `Code` on the top right of the repository.
```bash
git clone https://github.com/Bocchio01/CFD_Simulation_Engine.git
```
### Compile the source code
Given the relavitely complexity of the code, it is recommended to use the `CMake` build system to compile the code.
You can compile the code by typing the following command from the root folder of the repository:
```bash
mkdir build
cmake -S . -B build
cmake --build build
```
### Run the code
If you have compiled the code using the `CMake` build system, you can run the code by typing the following command from the root folder of the repository:
```bash
./build/Debug/CFD_Simulation_Engine
```
Here is an example of how to run the code with the default parameters:
```bash
./build/Debug/CFD_Simulation_Engine -i simulations/input/input.json -f DAT
```
### Plot the results
You can plot the results using the `MATLAB` script provided in the `simulations/plotting` folder.
## Trouble shooting
If you have any trouble, please feel free to contact me.
Have a nice coding day,
Tommaso :panda_face: