" ERROR #004100018, Fatal overflow in linear solver." In Transient CFD.

cheap_person · August 13, 2024, 09:03

Transient CFD Analysis of Rotor and Stator | Time Transformation | Ansys CFX

Hi there,
I'm trying to do a simulation of {impeller + diffuser}.
no of blades in impeller, diffuser is 15 and 25 respectively.

1. The following image shows the Boundary conditions of the simulation:

2. The following image shows the basis setting of Transient blade row model of the simulation:

but while processing the simulation it shows an error, as shown in Picture:

Your efforts will be warmly appreciated.
cheap person

Hamidzoka · August 13, 2024, 11:28

Hi,
divergence could be due to the large pressure difference i.e. from 1 to 5 bar. This huge presusre gradient can causae problem particularly at early iterations where flow field is not properly formed. You need a really good initial solution to tackle the issue.
Also you can check convergence with lower pressure differences.

Best

arjun · August 13, 2024, 13:43

What he said.

Check if you have some potential flow based initialization.

QUOTE=Hamidzoka;873366]Hi,
divergence could be due to the large pressure difference i.e. from 1 to 5 bar. This huge presusre gradient can causae problem particularly at early iterations where flow field is not properly formed. You need a really good initial solution to tackle the issue.
Also you can check convergence with lower pressure differences.

Best[/QUOTE]

August 13, 2024, 09:03	" ERROR #004100018, Fatal overflow in linear solver." In Transient CFD.	#1
cheap_person New Member cheap person Join Date: Mar 2024 Location: New Delhi, India Posts: 19 Rep Power: 2	Transient CFD Analysis of Rotor and Stator \| Time Transformation \| Ansys CFX Hi there, I'm trying to do a simulation of {impeller + diffuser}. no of blades in impeller, diffuser is 15 and 25 respectively. 1. The following image shows the Boundary conditions of the simulation: 2. The following image shows the basis setting of Transient blade row model of the simulation: but while processing the simulation it shows an error, as shown in Picture: Your efforts will be warmly appreciated. cheap person

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August 13, 2024, 11:28		#2
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 293 Rep Power: 18	Hi, divergence could be due to the large pressure difference i.e. from 1 to 5 bar. This huge presusre gradient can causae problem particularly at early iterations where flow field is not properly formed. You need a really good initial solution to tackle the issue. Also you can check convergence with lower pressure differences. Best

August 13, 2024, 13:43		#3
arjun Senior Member Arjun Join Date: Mar 2009 Location: Nurenberg, Germany Posts: 1,285 Rep Power: 34	What he said. Check if you have some potential flow based initialization. QUOTE=Hamidzoka;873366]Hi, divergence could be due to the large pressure difference i.e. from 1 to 5 bar. This huge presusre gradient can causae problem particularly at early iterations where flow field is not properly formed. You need a really good initial solution to tackle the issue. Also you can check convergence with lower pressure differences. Best[/QUOTE]