1. Plume V4 - Application case E-mail: engineering.software@astrium.eads.netengineering.software@astrium.eads.net Web: http://www.systema.astrium.eads.net/http://www.systema.astrium.eads.net/

2. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. Plume  The SYSTEMA / Plume computation proceeds in two steps:  The flow field computation (not detailed here)  The plume impingement computation  Convective heat flux  Pressure / tangential stress  Mass flow  The thruster flow field is defined by 2 files: .THERMO: thermodynamic properties of the gas .FLOW: flow field characteristics  Density, temperature, Mach number…

3. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. Plume flow field  The thruster used for the analysis is named test  It is defined by 2 files  Test.FLOW  Test.THERMO

4. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. T3D: Plume properties  Once the geometrical model has been created, the Plume properties have to be defined  It allows the user to define:  The material  The thrusters  The temperature  Some computation parameters

5. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Model preparation  In addition to the two large electric thrusters the satellite is operated with four small chemical thrusters  They have to be carefully placed in the model  To create the first one:  Create a new object T1 as son of the object Thrusters  Create a new shape in T1 : for Plume analysis all the thrusters have to be a cone:  P1 = (0.87, 0.77, 0.025) ; P2 = (0.77, 0.77, 0.025) ; Diam1 = 0.1  Create the three other thrusters with the following characteristics  P1 = (0.87, 0.77, 2.515) ; P2 = (0.77, 0.77, 2.515) ; Diam1 = 0.1  P1 = (-0.87, 0.77, 0.025) ; P2 = (-0.77, 0.77, 0.025) ; Diam1 = 0.1  P1 = (-0.87, 0.77, 2.515) ; P2 = (-0.77, 0.77, 2.515) ; Diam1 = 0.1

6. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Meshing generation  In order to generate a meshing, click on meshing tab  Click on new, select Plumimp  In Geometric meshing, select Split a*b*c and keep 1, 1, 1  In order to mesh the solar array  Double click on GS1  Choose a meshing by length  Select 0.1 (Length) and 30 (Maximum Angle)

7. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Setting the thrusters  In order to define the thruster and select the corresponding flow field,  In the meshing tab,  Right on Thruster 1 in the geometrical browser,  Select create specific meshing item / Thruster  Repeat this operation for the 4 chemical thrusters  The detailed characteristics of the thrusters can be edited in the Specific items browser

8. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Plume properties definition  The other parameters of the plume models can be defined in the Model browser  To set the temperature of the GS1:  Double click on GS1  Select Plumimp  In the temperature field, click on Overload and set the temperature to 330 K  The other parameters have not to be changed  Save the model and meshing by clicking on File / Save all  Generate the file Solo.sysmsh

9. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Display of the models parameters  In the Model tab, click on Configuration icon and select Temperature in the Plumimp properties list Configuration icon

10. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Launch computation  In the processing tab  Select new  Select Plumimp  Set the current mission to Meshing / Solo.sysmsh  Set the Flow to Test.FLOW  Set the Thermo to Test.THERMO  Click on run

11. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Display the results  To display the results  Select the meshing  Open the Configuration menu / Entities configuration / Result / All thrusters / Thermal flux

12. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Define kinematics  In the kinematics tab  Create a kinematics body for GS1  Define a kinematic law by Linear attitude

13. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Configure mission  In the mission tab  Create a new mission  Select Solo.sysmdl, Solo.sysmsh, Solo.syskin  Associate GS1 to the kinematics body GS1  Create computation events / Events set

14. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. SOLO: Check mission  In the Entities configuration menu, select to display in textual information: Current Attitude  Select GS1 in the Brower  Check that the rotation of the solar array is 10° every 10 days

15. This document is the property of Astrium. It shall not be communicated to third parties without prior written agreement. Its content shall not be disclosed. All rights reserved. Perform computation with kinematics  In the mission, switch current mission to Mission / Solo.sysmis and launch the computation  Display the results in the mission tab and animate them