#### Introduction

On the platform an estimated runtime is shown when submitting a case (Design or Simulation). This runtime is an estimate from a reference case. The actual time taken to complete a case can vary and is influenced by different factors. After submitting a case, the time taken to complete the case is updated on the platform and typically is unique to the case.

In order to keep the computation time of your case to a minimum, you can take into account a few factors. Below you can find an overview of the factors that affect the computation time. Please note that the computation times indicated in the table are an estimation and can depend on the complexity of your case. The complexity of your case depends on whether or not your case has a complex geometry, geometry with small features, regions which significantly differ in size,…

#### Simulation

The estimated time for a simulation to finish is 1 day for general cases. The table below shows an estimate of different factors that can affect the computation time. Using this as a reference you can estimate the approximate time taken for your case to be completed.

Conceptual | Detailed | ||
---|---|---|---|

Baseline credit amount |
15 credits | 100 credits | |

Resolution level |
|||

Conceptual | 1 day | ||

Detailed | 1 day (see note) | ||

Number of regions |
|||

Solid regions | 1 | +0 days | +0 days |

5 | +0.15 days | +0.1 days | |

10 | +0.3 days | +0.2 days | |

20 | +0.6 days | +0.4 days | |

Rule of thumb for more than 1 solid region | +0.03 days times the number of solid regions | +0.02 days times the number of solid regions | |

Fluid regions | 1 | +0 days | +0 days |

2 | +1 day | +2 days | |

3 | +2 days | +4 days | |

Rule of thumb for more than 1 fluid region | +1 day times the number of fluid regions | +2 days times the number of fluid regions | |

Settings |
|||

Temperature dependent material properties | Total number of days times 2 | Total number of days times 2 | |

Buoyance enabled | Total number of days times 2 | Total number of days times 2 | |

Radiation enabled | Total number of days times 1.8 | Total number of days times 1.8 |

✎ Note |
---|

Increasing the amount of credits spend on your case will decrease the computational time and vice versa. For example if you assign 60 credits to your conceptual simulation case, the total number of days from the table above must be divided by 4. For a detailed simulation on the other hand, the time to completion will nearly double since 60 is less than the 100 baseline number. |

#### Design

The estimated time for a design to complete is 2 – 4 weeks depending on the resolution level. The table below shows an estimate of different factors that can affect the computation time. Using this as a reference you can estimate the approximate time taken for your case to be completed.

Conceptual | Detailed | ||
---|---|---|---|

Baseline credit amount |
100 | 100 | |

Resolution level |
|||

Conceptual | 16 day | ||

Detailed | 32 days | ||

Number of regions |
|||

Solid regions | 1 | +0 days | +0 days |

2 | +3 days | +1.5 days | |

3 | +6 days | +3 days | |

4 | +9 days | +4.5 days | |

Rule of thumb for more than 1 solid region | +3 days times the number of solid regions | +1.5 days times the number of solid regions | |

Fluid regions | 1 | +0 days | +0 days |

2 | +16 day | +32 days | |

3 | +32 days | +64 days | |

Rule of thumb for more than 1 fluid region | +16 day times the number of fluid regions | +32 days times the number of fluid regions | |

Settings |
|||

Temperature dependent material properties | Total number of days times 2 | Total number of days times 2 | |

Buoyance enabled | Total number of days times 2 | Total number of days times 2 | |

Radiation enabled | Total number of days times 1.8 | Total number of days times 1.8 |

✎ Note |
---|

Increasing the amount of credits spend on your case will decrease the computational time and vice versa. For example if you assign 200 credits to your conceptual design case, the total number of days from the table above must be divided by 2. The same holds for a detailed design case since both have a 100 credit baseline. |

#### Delivery type

Dependent on the number of credits you select for a case, you can assign less or more computational power to the case.

#### Factors that affect the computational time

- Type of submission: This refers to the type of design or simulation case that the user choses to run on the platform.
- Resolution level: It can be a conceptual or a detailed case. The conceptual case is a low resolution and takes less time than the detailed case which is in high resolution.
- Number of regions: The number of regions in the geometry uploaded on the platform plays a role on the computation time. While it is easier to include the entire assembly of the case on the platform, it will increase the computation time and is counterproductive. A better approach would be to include the regions that directly influence the case.
- Number of boundaries: The number of boundaries that are included in the case also affect the time. Like the regions, it is important to include the boundaries that directly influence the case.
- Number of targets: With generative thermal design, the user can benefit by running an optimization with multiple targets. The time will increase with the number of targets that is included.
- Buoyancy: Solving for buoyancy means an increased number of iterations of the heat and momentum equations which thereby increases the runtime as well.
- Radiation: When enabling radiation, the software solves the radiative heat transfer equation (RTE) at every stage of the optimization to ensure accurate results. This complex equation affects the runtime of the case.

✎ Note |
---|

Human errors: This involves errors in parameters and nonphysical case setups. This can lead to cases being stalled or increase the runtime making it infeasible. |