Unsteady Flow Error Code 157 – Please Help

[Tony Kittner]

I know there have been some posts about this error code, but here goes again. I can run all the demo programs fine using HEC-RAS 5.0, but running my newly created basin model, I get the following error(s) below. I don’t know if it is associated with a RAM problem or a problem with model setup. Any information would be greatly appreciated!

Plan: ‘Plan_UnsteadyFlow_031016’ (KlamathBasin.p06)
Simulation started at: 14Mar2016 08:19:09 PM
Using 64 Bit Computation Engines

Writing Geometry
Computing Bank Lines
Bank lines generated in 8818 ms
Computing River Edge Lines
River Edge Lines generated in 20384 ms
Computing XS Interpolation Surfaces
XS Interpolation Surfaces generated in 2459 ms
Completed Writing Geometry

Geometric Preprocessor HEC-RAS 5.0.0 February 2016

Finished Processing Geometry

Writing Event Conditions
Event Conditions Complete

Performing Unsteady Flow Simulation HEC-RAS 5.0.0 February 2016

Initial Backwater, Split flow optimization, iteration 1
Initial Backwater, Split flow optimization, iteration 2
Initial Backwater, Split flow optimization, iteration 3
Initial Backwater, Split flow optimization, iteration 4
Initial Backwater, Split flow optimization, iteration 5
Initial Backwater, Split flow optimization, iteration 6
Initial Backwater, Split flow optimization, iteration 7
Initial Backwater, Split flow optimization, iteration 8
Initial Backwater, Split flow optimization, iteration 9
Initial Backwater, Split flow optimization, iteration 10
Initial Backwater, Split flow optimization, iteration 11
Initial Backwater, Split flow optimization, iteration 12
Initial Backwater, Split flow optimization, iteration 13
Initial Backwater, Split flow optimization, iteration 14
Initial Backwater, Split flow optimization, iteration 15
Initial Backwater, Split flow optimization, iteration 16
Initial Backwater, Split flow optimization, iteration 17
Initial Backwater, Split flow optimization, iteration 18
Initial Backwater, Split flow optimization, iteration 19
Initial Backwater, Split flow optimization, iteration 20
Initial Backwater, Split flow optimization, iteration 21
Initial Backwater, Split flow optimization, iteration 22
Initial Backwater, Split flow optimization, iteration 23
Initial Backwater, Split flow optimization, iteration 24
Initial Backwater, Split flow optimization, iteration 25
Initial Backwater, Split flow optimization, iteration 26
Initial Backwater, Split flow optimization, iteration 27
Initial Backwater, Split flow optimization, iteration 28
Initial Backwater, Split flow optimization, iteration 29
Initial Backwater, Split flow optimization, iteration 30
*****************************************************************
FLOW OPTIMIZATION FAILED TO CONVERGE, PROFILE 1 Initial Profile
*****************************************************************
forrtl: severe (157): Program Exception – access violation
Image PC Routine Line Source
RasUnsteady64.exe 000000013F971B9E Unknown Unknown Unknown
RasUnsteady64.exe 000000013F57852B Unknown Unknown Unknown
RasUnsteady64.exe 000000013F4B76E7 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F5162E8 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F61F4B4 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F655055 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F470EE8 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F5CEC0F Unknown Unknown Unknown
RasUnsteady64.exe 000000013F6214C7 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F679346 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F70386B Unknown Unknown Unknown
RasUnsteady64.exe 000000013F45732E Unknown Unknown Unknown
RasUnsteady64.exe 000000013FDC76C6 Unknown Unknown Unknown
RasUnsteady64.exe 000000013F977A32 Unknown Unknown Unknown
kernel32.dll 0000000076EA59ED Unknown Unknown Unknown
ntdll.dll 00000000770DB371 Unknown Unknown Unknown

Error with program: RasUnsteady64.exe Exit Code = 157

Computations Summary

Computation Task Time(hh:mm:ss)
Completing Geometry 37
Preprocessing Geometry(64) 3
Unsteady Flow Computations(64) 23
Complete Process 1:04

[Anonymous]

Hi Tony,

When I had that problem, it usually helped me to the geometric pre-processor within RAS Mapper. Go to RAS Mapper, and under Geometries find the right geometry and have all the sublayers (like rivers, XS,…) shown. Right click on the 2D Flow Areas and select “Compute 2D Flow Areas Hydraulic Tables”. Then let it run and when you go back to run the unsteady flow analysis (close and reopen the analysis window) again and it has normally worked for me. Let me know if you have questions or if this doesn’t work.

[Anonymous]

ddidn’t work for me atleast….
Having the same issue after doing the above mentioned!
Is there any other way?

[Anonymous]

I got this same error on my unsteady 2D model. I tried removing all BCs and adding them back in – didn’t work. I also tried the “Compute 2D Flow Areas Hydraulic Tables” in RAS Mapper, then re-running the unsteady flow analysis – didn’t work.

The unfortunate solution was a general debugging technique mentioned here (ctrl+f ‘157’):

I saved my geometry as different versions, removed individual bridge/culvert breaklines, and checked the model after each removal. My model had around 15 bridges, but 4 were really complicated (5-6 culverts spaced closely to simulate piers). I started by removing those 4 breaklines one-by-one and the model to ran after the third removal. This indicated something was odd with that particular breakline so I made some adjustments to my culverts.

I hope this helps any future modelers who come across the 157.

[Author]

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