Attachment A-22 RWO 2 - Thermal CFD Analysis Example 22025.docx
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- Attached to
- THERMAL ANALYSIS ENGINEERING SERVICES
- Solicitation number
- MEL-2664-09192024
About this file
This document is a Representative Work Order (RWO) for a NASA mission involving thermal and fluids analysis of a spacecraft system during its Martian atmospheric descent. The scope includes developing CFD models to determine convective heat transfer coefficients, modifying existing thermal finite element models, performing thermal analysis to assess component temperature compliance, and providing weekly project support. Specific tasks include creating analytical tools for heat transfer assumptions, updating thermal models with convective boundary conditions, conducting thermal analysis for "Worst Case Hot" and "Worst Case Cold" scenarios, and documenting model parameters and assessments.
The associated federal contract opportunity is a Small Business Set-Aside solicitation (MEL-2664-09192024) for Thermal Analysis Engineering Services issued by the Jet Propulsion Laboratory (JPL). The cost-type contract is targeted at small businesses in the NAICS code 541715 with a size standard of 1,300 employees. Proposal submission is due by April 23rd, 2025, at 3:00 p.m. Pacific Time, with past performance information preferred by April 12th, 2025. JPL anticipates awarding multiple cost-reimbursable subcontracts in this initial study phase, though funding is not yet confirmed. Interested small businesses are advised to consult APEX Accelerators and Small Business Development Center resources for guidance.
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REPRESENTATIVE WORK ORDER (RWO) 2
SWO INFORMATION
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| SUBCONTRACTOR INFORMATION |
| Subcontractor Name: |
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WORK DESCRIPTION
| Work Title: |
| Planetary Entry Body Thermal Analysis |
| Start Date: | |
| At time of execution | End Date: |
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| ☐ Below Description | |
| ☐ Attachment(s) | |
| ☐ Incremental Funding |
Work Description:
Pursuant to the Provisions of the above Subcontract, the Subcontractor is authorized to proceed with the work as follows:
Statement of Work: See below for SOW.
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* Please fill out this section only if you chose “Level of Effort” under Effort Type.
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FINANCIAL SUMMARY
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Introduction
A future NASA mission involves entry, descent, and landing of a spacecraft system onto the surface of Mars. The scope of this work includes thermal and fluids analysis of the spacecraft for the atmospheric descent portion of the mission to assess compliance of component temperature requirement limits.
Analysis Overview
The portion of the mission to be analyzed is the post-heatshield separation of the entry body vehicle. In this configuration, the primary heatshield structure has been jettisoned, the parachute has been deployed, and the landed payload is now exposed to the Martian atmosphere.
An analytical thermal mass model of the landed payload and the attached heatshield structure is provided by JPL for this analysis.
The analysis involves determining the appropriate convective heat transfer assumptions and models for the interaction of the Martian atmosphere with the entry body, modifying the existing thermal mass models to accurately predict heat transfer in this environment, and perform thermal analysis runs on the resulting model.
Perform the following Tasks
1. Develop CFD models or other analytical tools to determine appropriate convective heat transfer coefficients and flow velocity assumptions to be applied to the entry body thermal model.
a. JPL will provide timeline assumptions for entry body speed, Martian atmospheric properties, and other parameters as required.
b. Assumptions will be grouped into “Worst Case Cold” and “Worst Case Hot” sets, with the intent that the amount of convective heat transfer will be bounded in the analysis.
c. CFD simulation may be used to determine heat transfer coefficients where necessary.
2. Modify entry body thermal models to map heat transfer coefficients and/or atmospheric flow velocity assumptions onto existing thermal finite element model (FEM).
a. Inherit existing thermal models from the JPL team.
b. Update existing thermal FEMs with convective boundary condition assumptions as derived in Task 1.
c. Perform iterative thermal analysis on FEM as needed to ensure accuracy of thermal convection assumptions.
d. Provide summary presentation of the thermal model and results.
3. Perform thermal analysis cases to show entry body component temperature compliance to the Temperature Requirements Table (TRT).
a. Initial temperatures for transient runs provided by JPL.
b. Perform thermal analysis for both Worst Case Hot and Worst Case Cold transient assumptions.
c. Compile an TRT compliance table clearly showing where temperature predictions violate TRT requirements for all components included in the entry body thermal model.
d. Produce transient temperature plots for a subset of components as specified by JPL (typically for components that are highly affected by convection or show TRT violations).
4. Provide support for a weekly tagup via Microsoft Teams. The tagup will target 1 hour per week, but allocate 1.5 hours per week in proposal. Some weeks will run shorter or be cancelled, and some weeks may run longer.
5. Documentation of the thermal models
a. Document model parameters, assumptions, properties, etc. and the location(s) used within the models to provide insight into the thermal FEMs.
b. For all model inputs, perform an engineering assessment of the quantitative values defined. Indicate any properties that seem out-of-family based on your past experience.
c. Output package will be in *.pptx or *.docx.
Deliverables
Deliver all modified thermal FEMs and other documentation generated and utilized throughout the course of this subcontract work order.
JPL 7478 Rev 05/22 image1.png image2.png image3.png image4.png
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